List of Supergirl episodes - wikipedia List of Supergirl episodes Supergirl is an American superhero action - adventure drama television series developed by Ali Adler, Greg Berlanti and Andrew Kreisberg, based on the DC Comics character Supergirl ( Kara Zor - El ), created by Otto Binder and Al Plastino, that originally aired on CBS and premiered on October 26, 2015. Supergirl is a costumed superheroine who is the biological cousin to Superman and one of the last surviving Kryptonians. The series was officially picked up on May 6, 2015, and received a full season order on November 30, 2015. On May 12, 2016, Warner Bros. Television announced that the series had been renewed for a second season and that it would move from CBS to The CW, where it debuted on October 10, 2016. On January 8, 2017, The CW renewed the series for a third season, which began airing on October 9, 2017. As of February 5, 2018, 55 episodes of Supergirl have aired. Contents 1 Series overview 2 Episodes 2.1 Season 1 ( 2015 -- 16 ) 2.2 Season 2 ( 2016 -- 17 ) 2.3 Season 3 ( 2017 -- 18 ) 3 Ratings 3.1 Season 1 ( 2015 -- 16 ) 3.2 Season 2 ( 2016 -- 17 ) 3.3 Season 3 ( 2017 -- 18 ) 4 References Series overview Season Episodes Originally aired Nielsen ratings First aired Last aired Network Rank Average viewership ( in millions ) 20 October 26, 2015 ( 2015 - 10 - 26 ) April 18, 2016 ( 2016 - 04 - 18 ) CBS 39 9.81 22 October 10, 2016 ( 2016 - 10 - 10 ) May 22, 2017 ( 2017 - 05 - 22 ) The CW 129 3.12 23 October 9, 2017 ( 2017 - 10 - 09 ) June 18, 2018 ( 2018 - 06 - 18 ) TBA TBA Episodes Season 1 ( 2015 -- 16 ) No. overall No. in season Title Directed by Written by Original air date Prod. code U.S. viewers ( millions ) `` Pilot '' Glen Winter Story by : Greg Berlanti & Ali Adler & Andrew Kreisberg Teleplay by : Ali Adler October 26, 2015 ( 2015 - 10 - 26 ) 276088 12.96 Before the destruction of the planet Krypton, Kal - El is sent to Earth along with his cousin Kara Zor - El. The planet 's implosion forces her ship off course and into the Phantom Zone for 24 years, before landing on Earth. Kal, now operating as the superhero Superman in Metropolis, puts Kara in the care of the Danvers in National City. Twelve years later, Kara, working at the media conglomerate CatCo, reveals her powers as a vigilante. She tells her co-worker, Winn Schott, about her secret and he starts aiding her. Her cold - hearted boss, Cat Grant, titles the vigilante `` Supergirl ''. Alex, Kara 's adoptive sister, is revealed to be working at the Department of Extra-Normal Operations ( DEO ), under the leadership of Hank Henshaw, investigating alien activity. Kara learns that there are hundreds of aliens on Earth, most of whom came from a prison that was run by her mother, Alura. Her actions attract the attention of an alien called Vartox, and she is able to defeat him, although he then kills himself. James Olsen, another one of Kara 's colleagues, reveals that Kal sent him to look after her and presents her with a new cape. Vartox 's superior is revealed to be Astra In - Ze, Alura 's identical twin sister, who wants to conquer Earth. `` Stronger Together '' Glen Winter Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Andrew Kreisberg & Ali Adler November 2, 2015 ( 2015 - 11 - 02 ) 4X7602 8.87 In an effort to put a positive image on Supergirl in the wake of a serious mishap, Kara asks Winn and James to help her perfect her skills, while Hank and Alex put Kara through extensive physical training. Kara learns that an alien of the Hellgrammite species who escaped from Fort Rozz, Alura 's prison, is on Earth searching for chlorine - based food. The DEO prepares an ambush for the Hellgrammite, but it escapes, kidnaps Alex, and takes her to Astra, who uses Alex as a trap for Kara. As Kara and Astra fight, Hank injures Astra with a Kryptonite knife and Alex kills the Hellgrammite. Learning that Kara has become more powerful than she had imagined and that humanity has a means of weakening Kryptonians, Astra muses that her `` plans '' may need to be postponed. Alex provides Kara with an interactive artificial intelligence of Alura 's consciousness. Meanwhile, Cat pressures James to get her an interview with Supergirl. In the end, Kara agrees to the interview and prevents James from getting fired. It is also revealed that Hank might have a secret of his own when his eyes glow red. `` Fight or Flight '' Dermott Downs Michael Grassi & Rachel Shukert November 9, 2015 ( 2015 - 11 - 09 ) 4X7603 8.07 During the interview with Cat, Kara accidentally reveals that she is Superman 's cousin. After Cat exposes the relationship, Kara is attacked by Reactron, who seeks to kill her in order to get his revenge on Superman, but she manages to send him fleeing. He later goes to LORD Technology labs and kidnaps Maxwell Lord to get him to fix his suit. Kara later learns that a reactor meltdown Superman stopped in the past killed Reactron 's wife. She goes to the hideout of Reactron, identified as Ben Krull, and manages to save Maxwell, only to get badly injured by Krull afterwards, but Superman comes to save her. She gets mad at James for calling Superman for help. During a party Cat organized, Krull breaks in to find Supergirl. While James distracts Reactron, Kara covers her hand in lead so that she can use it to safely remove the power core in Krull 's suit and defeat him. Kara, who has feelings for James, witnesses his ex-girlfriend, Lucy Lane, also Lois Lane 's younger sister, paying him a visit to restart their relationship. `` How Does She Do It ? '' Thor Freudenthal Yahlin Chang & Ted Sullivan November 23, 2015 ( 2015 - 11 - 23 ) 4X7604 7.19 Cat leaves town, entrusting her son Carter to Kara. A bomber starts targeting Lord 's company. On the opening night of Lord 's new bullet train, Kara and the DEO find out about two bomb threats simultaneously, one at the airport and one on the train. The DEO goes to the airport, where Hank secretly uses his powers to deactivate the bomb. Kara goes to the train to save Carter, who is on it with the bomber. As she confronts the bomber, he claims that he is doing it for his daughter. He requests her to save the people on the train after he starts the timer, killing himself. At DEO headquarters, Alex finds a fail - safe in the bomb defused by Hank, who claimed it was just a decoy. Kara deduces that Lord was the one behind the bombings. As Supergirl, she confronts Lord, who implies that the threats were used to test her skills. He also vows to find the person important to her on the train. Meanwhile, James initially refuses to date Lucy, but Kara convinces him to return to her. 5 5 `` Livewire '' Kevin Tancharoen Roberto Aguirre - Sacasa & Caitlin Parrish November 16, 2015 ( 2015 - 11 - 16 ) 4X7605 7.77 After fighting an alien escapee, Kara meets Alex at the apartment to greet the latter 's mother, Eliza, for Thanksgiving, inviting Winn due to his lack of plans. CatCo 's shock jock, Leslie Willis is demoted by Cat to traffic reporting after a controversial bashing of Supergirl. During a severe thunderstorm, Kara tries to save Leslie, but lightning strikes them both, imbuing Leslie with electromagnetic powers. Leslie takes the name `` Livewire '' and tries to take revenge on Cat, but Kara eventually stops her and she is imprisoned at the DEO. Cat and Kara become closer. Meanwhile, Alex tells Eliza in a fit of rage at the dinner table that she 's actually working for the DEO. Eliza reveals to Alex and Kara that her husband, Jeremiah, offered himself up to work for Henshaw in exchange for Kara 's safety and then died mysteriously. Alex and Kara decide to investigate Henshaw and find the truth about Jeremiah 's death. 6 6 `` Red Faced '' Jesse Warn Michael Grassi & Rachel Shukert November 30, 2015 ( 2015 - 11 - 30 ) 4X7606 8.02 Kara hurts a civilian due to her uncontrolled anger. Sam Lane, Lucy 's father and also a military general, arrives at the DEO with her as his attache, demanding Supergirl let them test her powers by fighting an android called Red Tornado, which is invented by T.O. Morrow. She overpowers Red Tornado, leading to Sam firing Morrow. Sam is later attacked by Red Tornado, but Kara saves him. The DEO realizes that Red Tornado is actually a drone controlled by Morrow. Alex and Kara engage Morrow and Red Tornado, respectively. Alex kills Morrow, making Red Tornado engage Kara without control. She uses her eyes enhanced by her rage to destroy it. Lucy resigns from military service in order to stay with James. Kara finds out that her powers have diminished when she cuts herself and starts bleeding. Meanwhile, Winn informs Kara and Alex that Jeremiah and Hank went on a mission in South America, where Jeremiah died, deducing that Hank is the last person to have seen him alive. 7 7 `` Human for a Day '' Larry Teng Yahlin Chang & Ted Sullivan December 7, 2015 ( 2015 - 12 - 07 ) 4X7607 7.67 As Kara tries to adapt to life without her powers, an earthquake hits National City. Winn informs Kara that she needs a rise of adrenaline in her blood to regain her powers. The team begins saving the CatCo staff upstairs by the elevator shaft, from where James falls after saving everyone. Kara regains her powers and saves him before rushing to help the citizens. Winn becomes jealous of the intimacy between her and James. Afterwards, Kara is attacked by Astra and her operatives. Meanwhile, the earthquake causes a DEO prisoner called Jemm, who has psychic abilities to read and control minds, to escape. Hank locks the facility and takes a team to engage Jemm, with the former being the only survivor. That causes Alex to become more suspicious of Hank. She locks him in a room and engages Jemm alone, being overpowered. Hank arrives in time and kills him. He explains to her that he is the sole survivor of an alien species and his name is J'onn J'onzz. He killed the real Hank after the latter killed Jeremiah, who tried to save J'onn. He then assumed Hank 's shape and identity. 8 8 `` Hostile Takeover '' Karen Gaviola Roberto Aguirre - Sacasa & Caitlin Parrish December 14, 2015 ( 2015 - 12 - 14 ) 4X7608 7.28 Kara is overpowered by Astra and escapes. In a second duel, the former defeats the latter and brings her to the DEO, where the latter states that all she wanted was to save Krypton, the same thing she wants for Earth. She also reveals that Alura used Kara on Krypton to arrest the former. Kara confronts the interactive artificial intelligence of Alura, who refuses to confirm that Astra 's plan could have worked. It is revealed that Astra wanted to get arrested in order to divert attention from her husband, Non, and his team from attacking LORD Technologies. Kara rushes there and engages him. Meanwhile, Cat 's emails are hacked and her personal information is leaked to the press. Kara finds out that the chairman of the board was behind the hack and provides Cat with evidence by the help of James, Lucy and Winn, leading to the chairman 's arrest. Kara also finds out from the leaks that Cat has a 24 - year old son named Adam Foster. Cat reveals to Kara that she has found out about the latter 's alter ego. 9 9 `` Blood Bonds '' Steve Shill Ted Sullivan & Derek Simon January 4, 2016 ( 2016 - 01 - 04 ) 4X7609 8.75 Non overpowers Kara and leaves with Hank. Lord sends the DEO away from his facility, vowing to defend it himself, and returns to a secret experiment he is conducting. Non offers to trade Hank for Astra, but Sam, who is placed in charge of the DEO by the President, refuses. He tortures Astra for Non 's location, and walks into a trap placed by Non. Kara is distraught over both her defeat and the fact that Cat will fire her unless she is convinced that Kara is not Supergirl. Kara goes to the DEO and talks with Astra who tells her that Alura believed her claim that Krypton was doomed, but sentenced her for her illegal methods while promising to work for her cause. Alex and Kara make the trade over Lane 's objections and Astra orders Non to withdraw despite his numerical advantage. Sam and his men leave the DEO. Hank uses his shape - shifting power to present Cat with Kara and Supergirl simultaneously, casting doubt on her initial deduction of their identities. Kara, James and Winn decide to find the secret about Lord, who is shown in possession of an alien woman. 10 10 `` Childish Things '' Jamie Babbit Story by : Yahlin Chang Teleplay by : Anna Musky - Goldwyn & James DeWille January 18, 2016 ( 2016 - 01 - 18 ) 4X7610 8.77 Winn 's father, known as the Toyman, escapes from prison, leaving the former a message to meet him. Winn tells the FBI about it. They find it a trap, but Kara saves them. Winn reveals that his father 's boss, Chester Dunholtz, stole his toy designs, leading to the Toyman trying to kill Dunholtz, killing other people instead and going to jail. The Toyman kidnaps Winn, demanding him to attend a ceremony to kill Dunholtz and threatening to kill the other guests by the bombs he has planted. Kara manages to save the guests and have the Toyman arrested. Lucy accepts Cat 's job offer and Winn addresses his feelings to Kara. Meanwhile, Alex goes to dinner with Maxwell, giving Hank the chance to infiltrate LORD Technologies by shapeshifting into Maxwell. He finds the woman and takes pictures, but is forced to clear a security guard 's memory to escape without arousing suspicion. Maxwell is revealed to be monitoring Alex using a camera and microphone he planted on her purse. He finds out about Supergirl 's identity. 11 11 `` Strange Visitor from Another Planet '' Glen Winter Michael Grassi & Caitlin Parrish January 25, 2016 ( 2016 - 01 - 25 ) 4X7611 7.90 Miranda Crane, an anti-alien Senator, arrives in National City and is attacked by an alien. Kara saves Crane and brings her to the DEO, where Hank reveals to Alex that the alien is a White Martian, whose species wiped out the Green Martians, Hank 's species. Kara finds out that the Crane inside the DEO is actually the White, who is a shapeshifter. The White escapes, abducting Alex. Hank proposes a trade of himself with Alex, which the White accepts. Kara interrupts the exchange, giving Hank the chance to attempt to kill the White, but Kara dissuades him and the White is incarcerated in the DEO. Crane withdraws from her anti-alien initiative. Meanwhile, Kara and Winn become distant to each other. Adam pays a visit to Cat due to receiving a letter, which was actually written by Kara. Adam and Cat find it hard to develop a relationship, but Kara later helps them reconcile. Adam asks Kara on a date, which she accepts. An identical Supergirl appears in National City. 12 12 `` Bizarro '' John Showalter Roberto Aguirre - Sacasa & Rachel Shukert February 1, 2016 ( 2016 - 02 - 01 ) 4X7612 6.68 It is revealed that the new Supergirl is the woman Maxwell has been experimenting on and has brainwashed her with the sole purpose of killing the prime Supergirl. Cat titles her `` Bizarro '', who later witnesses Supergirl saving civilians and realizing that Supergirl is not a bad person, as Maxwell has dictated to her. However, Maxwell convinces her to continue hunting Supergirl. Bizarro attacks Kara when she is out with Adam, making her realize that Maxwell knows her identity. The DEO uses Kryptonite on Bizarro, whose face gets deformed instead and manages to escape. Kara decides to end her relationship with Adam. Maxwell advises Bizarro to use a person Supergirl cares about, so she kidnaps James. Kara arrives and engages her before Alex uses a modified Kryptonite to weaken Bizarro, who is rendered unconscious and kept in the DEO. Alex brings Maxwell to the DEO and locks him up, so he threatens Eliza indirectly. Back at her apartment, Kara is attacked by an unknown creature. 13 13 `` For the Girl Who Has Everything '' Dermott Downs Story by : Andrew Kreisberg Teleplay by : Ted Sullivan & Derek Simon February 8, 2016 ( 2016 - 02 - 08 ) 4X7613 7.92 The creature, which is known as the Black Mercy, places Kara in a dreamlike state that has her imagining she is back on Krypton. The Black Mercy is part of a plot by Non, who is using Earth 's technology to launch `` Myriad '', which he and Astra are planning to use to wipe out humanity. Astra secretly informs Alex of the Black Mercy, and the latter enlists the help of Hank, Winn, Maxwell, and James to save Kara, with Alex entering Kara 's mind to pull her out and bring her back to reality. When Kara comes back, she seeks revenge on Non and stops him, who escapes with after revealing the word `` Myriad ''. Elsewhere, Astra engages Alex and Hank, who fights as the Martian Manhunter. The former overpowers him before Alex impales her with a Kryptonite sword, killing her. Kara arrives and Hank tells her that he killed Astra instead of Alex, who starts to feel guilty over whether she should tell Kara the truth. Non vows revenge on Kara in the wake of Astra 's death. 14 14 `` Truth, Justice and the American Way '' Lexi Alexander Story by : Michael Grassi Teleplay by : Yahlin Chang & Caitlin Parrish February 22, 2016 ( 2016 - 02 - 22 ) 4X7614 7.25 Kara and Non pay their final respects to Astra, and he vows to kill her after he finishes mourning. Kara, Alex, and J'onn track down an armored alien known as the Master Jailer, whom they discover was a guard at Fort Rozz. He has become a vigilante who kills the alien fugitives, including those convicted of non-violent crimes such as a professor sentenced for drug smuggling. Kara confronts the Jailer, but he takes her prisoner and plans to execute her for not joining him. The DEO pinpoints their location and Kara is able to save the professor and defeat the Jailer. Alura refuses to reveal anything about Myriad and Kara realizes she can not forgive J'onn for killing Astra. Meanwhile, Cat assigns James and Lucy to investigate Maxwell 's disappearance. Tensions between James and Lucy develop after he reveals his knowledge of the DEO and friendship with Supergirl. The DEO releases Maxwell, threatening to disclose his criminal activity if he reveals Supergirl 's identity or the DEO 's location. Kara finds competition in Cat 's new `` first assistant '' Siobhan Smythe. 15 15 `` Solitude '' Dermott Downs Story by : Rachel Shukert Teleplay by : Anna Musky - Goldwyn & James DeWille February 29, 2016 ( 2016 - 02 - 29 ) 4X7615 6.69 A hacker steals the personal information of several people and gives it to Cat for disclosure, which she refuses. The hacker, turned out to be an alien named Indigo with the ability to use the internet for traveling, announces her decision to destroy National City. Kara leaves the DEO and enlists the help of James and Lucy to stop Indigo while the DEO enlists Winn for it. Lucy realizes that Indigo 's intention in the hacking was only one person, a military general with access to the nuclear arsenal. Indigo infiltrates the nuclear base using the general 's cell phone and launches a missile towards National City. Kara stops it using the DEO 's help. Winn uploads a virus to Indigo, destroying her after she reveals to Kara that it was she who helped Kara 's ship exit the Phantom Zone., which in turn facilitated Fort Rozz 's expulsion. Kara decides to rejoin the DEO, and Alex reveals the truth about Astra, being forgiven by Kara. Lucy ends her relationship with James, accusing him of loving Kara. Winn and Siobhan develop a relationship. Non recovers Indigo 's pieces and revives her. 16 16 `` Falling '' Larry Teng Robert Rovner & Jessica Queller March 14, 2016 ( 2016 - 03 - 14 ) 4X7616 6.53 After helping fight a warehouse fire, Supergirl inadvertently comes into contact with Red Kryptonite which ovrerides her inhibitions. Kara / Supergirl soon becomes more cold, shallow, and cynical, which causes Winn, Jimmy, Alex, and even Cat to wonder what is going on with her. Kara even goes so far as to rat out the back - stabbing Siobhan by leaking information that Siobhan has been contacting the Daily Planet for information on Supergirl 's actions, which results in Cat terminating Siobhan 's employment. It soon turns out that Maxwell Lord created the so - called Red Kryptonite, in the hopes of stopping Non 's next attack. After the compromised Supergirl makes an attempt on Cat 's life, Cat goes on TV and denounces Supergirl. Alex and Maxwell are forced to form an uneasy alliance while he tries to help the DEO stop Supergirl. After a climactic battle downtown, the DEO is able to subdue and cure Supergirl, but at the price of Hank revealing himself as the Martian Manhunter. 17 17 `` Manhunter '' Chris Fisher Story by : Derek Simon Teleplay by : Cindy Lichtman & Rachel Shukert March 21, 2016 ( 2016 - 03 - 21 ) 4X7617 6.00 While Kara is trying to win back National City 's trust, the hot - headed Marine Colonel James Harper ( guest star Eddie McClintock ) begins an investigation into the J'onn affair with Lucy, having re-enlisted into the Army at her previous rank of Major, as his legal assistant. Hank / J'onn J'onzz then tells the backstory about how he first met Jeremiah Danvers ( guest star Dean Cain ) 10 years earlier while he and Hank were on a mission in South America to find him and how J'onn took his identity to oversee the DEO. After her interrogation, the vindictive Lucy implicates Alex with her knowledge about J'onn's real identity. After learning that Hank and Alex are on their way to Project Cadmus, Kara finally tells Lucy that she is Supergirl and convinces her to help rescue Hank and Alex. Hank learns that Jeremiah is still alive, so he and Alex go on the run to find him, but not before manipulating Harper into resigning from the Marines and appointing Lucy as the acting director of the DEO. Meanwhile, Siobhan tries to get revenge on Kara for getting her fired, but gets caught by Winn and discovers that she has the power to sonic scream. 18 18 `` Worlds Finest '' Nick Gomez Story by : Greg Berlanti Teleplay by : Andrew Kreisberg & Michael Grassi March 28, 2016 ( 2016 - 03 - 28 ) 4X7618 7.17 Siobhan discovers that the women in her family are cursed with the spirit of a banshee, which can only be quieted by killing whoever wronged them. Deciding to kill Kara, Siobhan frees Livewire from captivity at the DEO and suggests they team up to kill both Kara and Cat. Siobhan -- now calling herself Silver Banshee -- and Livewire kidnap Cat and wreak havoc on National City Park. Meanwhile, Supergirl has a run - in with Barry Allen / Flash, a superhero from a parallel Earth ( Earth - 1 ), whom she asks for his help to find Livewire and Silver Banshee. After a climatic fight in a downtown park, Kara is able to subdue them and win back National City 's trust. At the end, Kara discovers that everyone in National City has fallen under some kind of spell, revealed by Non to be the result of Myriad. This episode is a crossover with The Flash. 19 19 `` Myriad '' Adam Kane Yahlin Chang & Caitlin Parrish April 11, 2016 ( 2016 - 04 - 11 ) 4X7619 6.12 The Myriad effect has taken over National City and even Superman is under control, leaving Kara, Cat, and Maxwell as the only ones immune. Now, Kara must find a way to stop Non, but Maxwell is looking at destroying the Kryptonians with a Kryptonite bomb even at the risk of killing other humans. Cat objects and prompts Kara to find an alternative. The effect brings fugitives Alex and J'onn back after Alex tells Eliza the truth about Jeremiah and Hank Henshaw. When Indigo senses the two returning, she defeats J'onn, but takes Alex and places her under mind control as Non 's payback for Astra 's death. 20 20 `` Better Angels '' Larry Teng Story by : Andrew Kreisberg & Ali Adler Teleplay by : Robert Rovner & Jessica Queller April 18, 2016 ( 2016 - 04 - 18 ) 4X7620 6.11 Kara fights with Alex, who is controlled by Non. When Alex is about to kill Kara with the same Kryptonian sword used to kill Astra, their mother pleads with her to stop, breaking Non 's control over Alex. The team learns that hope is the key to stopping Myriad. Supergirl inspires the citizens of National City, waking them from the Myriad trance. However, Non is convinced by Indigo to kill all the humans on Earth by increasing Myriad 's frequency. Back at the DEO, Max warns Kara that she might not survive a solo fight with Non and Indigo ; J'onn later insists on helping her. Kara and J'onn confront Non and Indigo at Fort Rozz, which is powering Myriad. Kara defeats Non in a heat vision battle and J'onn rips Indigo 's body apart. As Indigo dies, she reveals that she locked the system so Myriad can not be shut down. Kara flies Fort Rozz into space, rendering Myriad harmless ; Alex rescues her using Kara 's pod. Afterward, J'onn is reinstated as the Director of the DEO and Cat gives Kara a promotion. While Kara celebrates at her house, another pod similar to the one in which Kara came to Earth crashes near National City. Kara opens the pod and is shocked by what is inside it. Notes ^ Jump up to : Following the November 2015 Paris attacks, the episode `` How Does She Do It ? '', which features content similar to the attacks and was originally scheduled to air as the fourth episode of the season on November 16, 2015, was pulled from its scheduled airing. In its place, the episode `` Livewire '', which was originally scheduled to air as the fifth episode on November 23, 2015, was aired. `` How Does She Do It ? '' then aired as the fifth episode on November 23. For the season 's home media release, the episodes were restored to their original production order, which is how the episodes are presented here. Season 2 ( 2016 -- 17 ) No. overall No. in season Title Directed by Written by Original air date Prod. code U.S. viewers ( millions ) 21 `` The Adventures of Supergirl '' Glen Winter Story by : Greg Berlanti & Andrew Kreisberg Teleplay by : Andrew Kreisberg & Jessica Queller October 10, 2016 ( 2016 - 10 - 10 ) T13. 20151 3.06 Kara finds an unknown young man lying unconscious in the pod and takes him to DEO. She prepares for a date with James just as the commercial spacecraft, the Venture, is launched into space. It suffers engine failure and descends to Earth, but Kara saves the craft with help from Superman. They discover the main target was Lena Luthor, the new CEO of Luthor Corp after her brother, Lex, was convicted of numerous crimes. In a ceremony where she renames the company L - Corp, she is attacked again by John Corben, an assassin. Alex engages him while Kara and Clark stop a building from collapsing. Corben reveals he was working for Lex before he is shot by Lena. Kara chooses to be a reporter for CatCo, a decision supported by Cat. Kara and James decide to keep their relationship friendly. Winn is formally hired to work at the DEO. Meanwhile, J'onn reveals to Alex that he was the one who found the first cluster of Kryptonite and decided to keep it against the wishes of Clark, who wanted to destroy it. At Project Cadmus, the organization 's leader revives Corben and begins turning him into a being called Metallo. 22 `` The Last Children of Krypton '' Glen Winter Robert Rovner & Caitlin Parrish October 17, 2016 ( 2016 - 10 - 17 ) T13. 20152 2.66 Kara and Clark continue operating together in National City before he decides to return to Metropolis. When they encounter Corben, who has turned into Project Cadmus ' prototypical cyborg, his Kryptonite - based powers pose a serious threat. The DEO deduces that there is a mole who smuggled the kryptonite out. During a subsequent encounter with Corben, another Metallo prototype goes on a rampage in Metropolis without opposition. Alex finds the mole, but he is killed by Cadmus 's leader, a scientist who intends to destroy aliens. Winn builds anti-kryptonite gear for Kara and Clark, who manage to defeat the Metallos with the help of Alex and Hank. Kara promises the Cadmus leader she will find her. Hank entrusts the remaining kryptonite to Clark, who returns to Metropolis. Meanwhile, Cat introduces Kara to the latter 's new boss, Snapper Carr, who does not like her and refuses to give her an assignment. Cat advises her to solve the problem herself and announces that she has decided to leave CatCo, leaving James in charge. Kara manages to prove her value to Snapper, who agrees to teach her. At the DEO, the alien man regains consciousness and attacks Kara. 23 `` Welcome to Earth '' Rachel Talalay Jessica Queller & Derek Simon October 24, 2016 ( 2016 - 10 - 24 ) T13. 20153 2.65 The alien man escapes the DEO. As President Olivia Marsdin arrives in National City to sign an act giving all aliens amnesty, she is attacked by an unknown alien with the power to shoot fiery energy, believed to be the escapee. Alex encounters police detective Maggie Sawyer at the crime scene, who takes her to a secret bar hosting aliens. Winn discovers the DEO escapee is from Daxam, Krypton 's sister planet. Kara defeats the Daxamite and returns him to the DEO. She is uncharacteristically hostile towards him, prejudging his intentions because of a long feud between the Kryptonians and Daxamites. The President is attacked again while signing the Alien Amnesty Act ; the assailant is revealed to be a woman, Scorch, who is defeated by Kara, Alex, and Maggie. Kara releases the Daxamite, who introduces himself as Mon - El. She tells him that Daxam 's population was annihilated and that Daxam is a wasteland due to Krypton 's destruction. Olivia briefly flashes an alien face as she leaves, unbeknownst to the members of the DEO. Meanwhile, Kara interviews Lena, who reveals that L - Corp has invented an alien detection device. In the bar, Hank encounters M'gann M'orzz, a female Green Martian. 24 `` Survivors '' James Marshall James Bamford Paula Yoo & Eric Carrasco October 31, 2016 ( 2016 - 10 - 31 ) T13. 20154 2.22 J'onn asks that Mon - El stay at the DEO until he is fully examined. An alien body is found and the DEO track down the murderer, who is then kidnapped by unknown armed men. Maggie and Alex track him down to a secret facility where a woman, Veronica Sinclair ( also known as Roulette ), hosts rich and powerful people. The aliens are forced to duel, sometimes to the death. They spot M'gann as a contestant before Kara intervenes and is attacked by an alien called Draaga, who overpowers her and escapes. J'onn confronts M'gann, who confesses her intense guilt for having survived the extinction of her species. Veronica abducts J'onn with M'gann's help. Using Lena, Kara finds the fight club 's new address, where J'onn and M'gann are forced to duel until J'onn convinces her to stop blaming herself and she refuses to continue. When they are attacked by Draaga, Kara arrives and defeats him thanks to Mon - El 's advice. She dissuades the other aliens from protecting Veronica, who is arrested but later released by orders from on high. M'gann secretly shapeshifts to reveal that she is a White Martian. 25 5 `` Crossfire '' Glen Winter Gabriel Llanas & Anna Musky - Goldwyn November 7, 2016 ( 2016 - 11 - 07 ) T13. 20155 2.47 A group of robbers, led by Chet Miner, starts challenging Supergirl using alien guns. Cadmus demands the repealing of the Amnesty as a solution. Kara deduces that Cadmus is arming Miner 's team. Lena holds a fundraiser which is attacked by Miner and his men. She reveals to Winn that the fundraiser was a ruse for the robbers and they activate a device that destroys the alien weapons, leading to the robbers ' arrest. Miner and his team are killed by Cadmus before he can expose them. The leader of Cadmus is revealed to be Lillian, Lena 's adoptive mother. Meanwhile, Kara takes Mon - El to CatCo for work, but he continuously ignores her commands, leading to him being fired. Alex convinces her to let him choose his own path. James starts operating as a vigilante. Winn finds out and initially reprimands him, but finally decides to help, intending to make a suit for him. Alex learns that Maggie has broken up with her girlfriend and tries to cheer her up, with Maggie realizing Alex is a lesbian and Alex herself accepting that fact. 26 6 `` Changing '' Larry Teng Story by : Greg Berlanti Teleplay by : Andrew Kreisberg & Caitlin Parrish November 14, 2016 ( 2016 - 11 - 14 ) T13. 20156 2.35 In Norway, a group of scientists led by Dr. Jones discover an abnormal wolf corpse, resulting in the mysterious murder of all of the scientists except Jones, who is revealed to be infected by a parasite. The DEO finds out that Jones killed the other scientists. Kara gets angry with Mon - El when she finds out that he has been using his powers to make money. The DEO predicts Jones ' next target and Kara and J'onn attempt to stop him, but he drains their powers, becomes larger and stronger, and escapes, leaving the pair weakened and unconscious and J'onn near death. Alex convinces M'gann to donate blood in order to save J'onn. Jones attacks his target again, but Mon - El intervenes. With his suit ready, James arrives to fight Jones too, taking the alias `` Guardian. '' Kara regains consciousness and attacks Jones, using Plutonium 239, which he absorbs, causing him to overload with energy and implode. James convinces Winn not to tell Kara about his alter ego. Mon - El is abducted by Cadmus. Meanwhile, Alex tells Kara about her feelings for Maggie. Kara encourages her to tell Maggie how she feels, but Maggie reveals that she would prefer to remain friends, upsetting Alex. 27 7 `` The Darkest Place '' Glen Winter Robert Rovner & Paula Yoo November 21, 2016 ( 2016 - 11 - 21 ) T13. 20157 2.61 A new vigilante appears and starts killing some of the criminals. Mon - El continues his escape plans. Lillian demands Kara come to Cadmus. Kara is overpowered by the real Hank, who is enhanced and called the `` Cyborg Superman. '' Winn helps identify vigilante criminal targets with James help to try and stop the serial killer. Lillian forces Kara to deplete her powers, giving the former the chance to take blood samples. Mon - El watches as Kara solar flares with depleted powers for Lillian. Jeremiah saves Kara and Mon - El and helps them escape by staying behind. Kara finally approves of the Guardian, unaware of his true identity only known to Alex. Mon - El recognises feelings for Kara. Cyborg Superman arrives at the Fortress of Solitude demanding to know about the `` Medusa '' project. Meanwhile, J'onn begins having hallucinations about M'gann locked in the DEO. She warns him about the transfusion. Alex finally accepts Maggie. 28 8 `` Medusa '' Stefan Pleszczynski Jessica Queller & Derek Simon November 28, 2016 ( 2016 - 11 - 28 ) T13. 20158 3.53 Cyborg Superman unleashes a virus in the alien bar, killing every alien there except Mon - El, who is quarantined by the DEO. Eliza Danvers, visiting for Thanksgiving, determines that the virus is Kryptonian. At the Fortress of Solitude, Kara learns that Henshaw was after `` Medusa '', a virus created by her father, Zor - El, to kill non-Kryptonians in case of alien invasion. At L - Corp, she stops Henshaw from getting the isotope required to disperse Medusa. Lena refuses to help when Kara reveals that Lillian is Cadmus ' leader. Later, Lena willingly gives Lillian the isotope. Kara and J'onn confront the Luthors and Henshaw before Medusa is disseminated via rocket launcher. J'onn fights Henshaw, becoming a White Martian, while Kara chases the rocket, which explodes and disperses Medusa. However, Lena has double - crossed Lillian and rendered the virus inert. Lillian is arrested, but Henshaw escapes. Eliza cures Mon - El and uses Medusa to restore J'onn's Green Martian form. Alex comes out to Eliza, who supports her. Later, Maggie and Alex kiss after Maggie admits she does have feelings for Alex. An unknown alien race is searching for Mon - El. Barry Allen and Cisco Ramon arrive from their Earth to enlist Kara 's help. This episode ends with a scene setting up the crossover event `` Invasion ! '' that begins on The Flash season 3 episode 8, continues on Arrow season 5 episode 8, and concludes on Legends of Tomorrow season 2 episode 7. 29 9 `` Supergirl Lives '' Kevin Smith Story by : Andrew Kreisberg Teleplay by : Eric Carrasco & Jess Kardos January 23, 2017 ( 2017 - 01 - 23 ) T13. 20159 2.65 Winn gets beaten aiding James, leading the former to believe he is not fit for field work. Kara starts investigating a strange series of missing persons. The DEO tracks the kidnappings to a fake clinical trial run by aliens. Searching for the missing people, Kara and Mon - El pass through a portal and land on the planet Maaldoria, epicenter of the slave trade. Realizing that they will not have their powers due to Maaldoria 's red sun, the pair tracks the kidnappees to a fortress, intentionally getting captured to wind up in the same cell as the others. They learn that Roulette is involved in the trafficking. Meanwhile, J'onn reveals that the Maaldorian atmosphere is lethal to Martians, making Alex the lead on the rescue team. She convinces Winn to join her, despite his misgivings. Kara incites a riot and the prisoners lock Roulette and her Maaldorian accomplice in the cell before escaping. After reuniting with the DEO, they get to the portal and return to Earth. Winn accepts his potential, while Mon - El, whom the Maaldorians intentionally allowed to leave, decides to become a superhero. An alien group is revealed to be searching for Mon - El. Maggie tells Alex about her knowledge of Kara 's alter ego. 30 10 `` We Can Be Heroes '' Rebecca Johnson Caitlin Parrish & Katie Rose Rogers January 30, 2017 ( 2017 - 01 - 30 ) T13. 20160 2.35 Kara starts training Mon - El. Leslie is found to be out of prison. Kara and Mon - El go off to engage Livewire, but it turns out to be another woman, who attacks the pair with a male of the same abilities. Mon - El ignores Kara 's instructions to protect the civilians, choosing to save her instead. The Guardian arrives and aids them. Their adversaries escape and Kara finds out about James ' alter ego, scolding him and Winn. She also gets angry with Mon - El for prioritizing her over the others. The DEO learns that Leslie was actually abducted from incarceration. Winn locates her. James and Mon - El rush there to prove themselves. The duo is captured by a scientist who has been draining Leslie 's powers and giving them to his subjects. Kara arrives and saves them, freeing Leslie and dissuading her from killing the scientist in exchange for allowing her to escape. Kara rejects James ' offer for cooperation in vigilantism. Mon - El confirms his feelings for her. Meanwhile, M'gann loses consciousness. J'onn agrees to bond with her. In a shared memory, he tells her that she is forgiven. She regains consciousness and J'onn frees her. She reveals that the White Martians are searching for her. 31 11 `` The Martian Chronicles '' David McWhirter Gabriel Llanas & Anna Musky - Goldwyn February 6, 2017 ( 2017 - 02 - 06 ) T13. 20161 2.43 J'onn starts following M'gann so as to protect her. Armek, her former mate, comes to Earth with orders to take her back to Mars for execution and gives her two hours to surrender before he goes after her friends. Fearful, J'onn decides to bring her to the DEO for protection. The real M'gann shows up, revealing the other one to be Armek in disguise, forcing J'onn to put the DEO into lockdown. Assuming Winn 's identity, Armek initiates a meltdown in the building 's nuclear reactor while another White Martian posing as Alex ambushes Kara. J'onn and M'gann free the real Winn and Alex and confront Armek, killing him with a metal pole. Winn fixes the reactor in time and Alex helps Kara subdue the other Martian. Afterwards, M'gann informs J'onn that she intends to return to her home planet in order to reform her people. Encouraged by Alex, Kara tries to ask Mon - El out on a date, only to find that he already has a relationship with Eve. 32 12 `` Luthors '' Tawnia McKiernan Robert Rovner & Cindy Lichtman February 13, 2017 ( 2017 - 02 - 13 ) T13. 20162 2.52 Lena testifies against Lillian, and Kara encourages her to visit Lillian, who reveals that she is her husband 's daughter from another woman. A package of synthetic kryptonite is sent to Corben. While testifying, he attacks the court and frees Lillian. A faked video is leaked showing Lena stealing the kryptonite and she is arrested on suspicion of helping Lillian. Corben breaks her out. Kara remains the only person to believe in Lena 's innocence. Lillian takes Lena to a remote facility set up by Lex before his imprisonment and forces her to access a stockpile of alien weapons, several of which she takes. Kara arrives and intervenes. Winn determines that the synthetic kryptonite is becoming increasingly unstable and will soon explode. Kara manages to save Lena before Corben self - destructs while Lillian and Henshaw escape by helicopter. Lena is exonerated, but begins contemplating her relationship with her family, especially Lex. Kara and Mon - El, who had a disastrous date with Teschmacher, confess their feelings for each other at her apartment when a man calling himself Mister Mxyzptlk arrives and declares his love for her. Meanwhile, Alex introduces Maggie to the group as her girlfriend. 33 13 `` Mr. & Mrs. Mxyzptlk '' Stefan Pleszczynski Jessica Queller & Sterling Gates February 20, 2017 ( 2017 - 02 - 20 ) T13. 20163 2.24 Mxyzptlk, an imp from the fifth dimension who can manipulate reality, proposes marriage to Kara, whose refusal he sees as a challenge. Mon - El suggests killing Mxyzptlk, which she rejects. Mxyzptlk summons Parasite to attack National City before killing it in order to impress her. Mon - El inadvertently reveals that another way to remove imps is by getting them to say or spell their names backwards. Later, Winn discovers a device in the DEO 's collection that is connected to the same fifth dimensional energy from which Mxyzptlk draws power. Mon - El attempts to use it to duel with Mxyzptlk to the death. Mxyzptlk eventually gains the upper hand and tries to kill Mon - El, only for Kara to arrive and agree to marry him. He later arrives at the Fortress of Solitude for their wedding, but Kara states that she will not marry him. Angered, he attacks her, but she stops the battle by locking the fortress down and activating the self - destruct sequence. Mxyzptlk begs for the code to stop the countdown but, after inputting the code, realizes that it spells his name backwards, vanquishing him. Mon - El and Kara develop a romance. Meanwhile, Winn starts dating Lyra Strayd, an alien from Starhaven, and Alex and Maggie celebrate their first Valentine 's Day together. 34 14 `` Homecoming '' Larry Teng Caitlin Parrish & Derek Simon February 27, 2017 ( 2017 - 02 - 27 ) T13. 20164 2.17 The DEO receives an alarm regarding a convoy departing from Cadmus. Kara and J'onn investigate and rescue a chained Jeremiah, who claims Cadmus has created a fusion bomb using energy from her heat vision. He persuades J'onn to reinstate him back at the DEO, which makes Mon - El suspicious, causing friction between him and Kara. He persuades Winn to watch Jeremiah, who attempts to access the DEO 's database, alerting Winn. After confronting Jeremiah, Kara is hesitant to accept his excuse, while Alex believes him. Winn locates the purported bomb, but the DEO finds nothing at the location. J'onn realizes he can not read Jeremiah 's mind and that he is working for Cadmus, having been cybernetically enhanced. Jeremiah overpowers J'onn and downloads information from the mainframe before escaping. Kara and Alex confront Jeremiah, Lillian, and Henshaw, and Kara rushes to save a train that Cadmus endangered while Alex goes after the trio. Jeremiah escapes due to Alex 's reluctance to shoot him. Winn later determines that Jeremiah downloaded the list of all the registered aliens in the country. 35 15 `` Exodus '' Michael Allowitz Paula Yoo & Eric Carrasco March 6, 2017 ( 2017 - 03 - 06 ) T13. 20165 2.16 Cadmus begins abducting aliens, so Kara asks Snapper to publish an article, but he insists on verifying her sources. When Supergirl confirms the story but refuses to reveal her own source, Snapper refuses to publish. Alex 's bias towards Jeremiah leads to J'onn suspending her, but Maggie decides to help her find him. They stop a Cadmus team from abducting an alien and find Cadmus ' holding site. Lena also finds out about the site before Lillian 's operatives attempt to stop her, but Kara manages to save Lena. At the Cadmus site, Alex is captured and Jeremiah reveals that Cadmus is planning to deport the aliens to another planet in a large spaceship. Meanwhile, Kara publishes the story on a blog, forcing Lillian to deport the aliens she already has. Alex convinces Jeremiah to help her stop the launch and, while he engages Cadmus operatives, she enters the ship and frees the aliens, but they are locked inside by another gate before the ship launches, programmed to accelerate to light speed once exiting the atmosphere. Supergirl arrives and manages to stop the ship. Snapper fires Kara from CatCo, while Alex is reinstated by J'onn. Daxamites arrive near the Moon. 36 16 `` Star - Crossed '' John Medlen Katie Rose Rogers & Jess Kardos March 20, 2017 ( 2017 - 03 - 20 ) T13. 20166 2.07 The Daxamites demand the humans relinquish Mon - El, who surrenders. Kara accompanies him and learns that Mon - El is actually the Prince of Daxam. The ship is commanded by his parents, who want him to lead his people and rebuild Daxam. Kara becomes angry with Mon - El for lying to her. She and Mon - El return to Earth. He apologizes several times, but to no avail. She eventually ends the relationship. Mon - El demands his parents leave him and Earth. Meanwhile, Winn and Lyra break into an art museum for a tryst. He is later arrested by Maggie, who reveals that a painting is missing. Alex convinces Maggie to give them 24 hours to prove Winn 's innocence. They find and capture Lyra, who reveals that her brother, Bastian, owes a large sum to a smuggler named Mandrax. She steals paintings to pay down Bastian 's debt. Winn frees Lyra as part of a sting operation. The DEO and Guardian then confront and arrest Mandrax and free Bastian. Winn later forgives Lyra 's dishonesty. The DEO has captured a new alien, who quickly hypnotizes Kara and escapes to Earth - 1 to fight Barry. Kara wakes up in a hallucination where she is a lounge singer. This episode is a crossover with The Flash season 3 episode 17. The scene at the end of the episode sets up the crossover. 37 17 `` Distant Sun '' Kevin Smith Gabriel Llanas & Anna Musky - Goldwyn March 27, 2017 ( 2017 - 03 - 27 ) T13. 20167 2.21 Kara is attacked by a series of alien bounty hunters. Mon - El suspects his parents are responsible and hope that he will abandon Earth if Kara is dead. His suspicion is confirmed after J'onn telepathically interrogates one of the hunters. Kara suggests she and Mon - El meet with Rhea, his mother, to change her mind. However, Rhea refuses to listen and tries to kill Kara using Kryptonite, so Mon - El agrees to leave Earth if she spares Kara 's life. Against President Marsdin 's orders, J'onn helps Kara rescue Mon - El from his parents ' ship and, after a fierce battle, King Lar Gand agrees to let Mon - El stay on Earth. Marsdin is revealed to be an alien. Rhea kills Lar Gand for what she views as his betrayal and vows to return to Earth to reclaim Mon - El. Meanwhile, after an encounter with an ex-girlfriend of Maggie 's, Alex learns that Maggie neglected to tell her that she cheated on the woman, prompting a frank discussion in which Alex asks Maggie to trust her with her secrets. 38 18 `` Ace Reporter '' Armen V. Kevorkian Paula Yoo & Caitlin Parrish April 24, 2017 ( 2017 - 04 - 24 ) T13. 20168 1.80 Lena invites Kara to a press conference being held by her former boyfriend Jack Spheer, who unveils Biomax, a new nanobot technology that can heal human ailments. After the conference, Kara is approached and told the human trials of Biomax were faked, but her source is killed by the nanobots before she is told more. Kara and Mon - El crash Lena and Jack 's dinner date and take Jack 's keycard for his office, discovering footage showing Jack injecting Biomax into himself. Kara later shows the footage to Lena, who confronts Jack and discovers he is being controlled by his CFO Beth Breen via the side effect of the nanobots, loss of free will. Supergirl then turns up to save Lena, but when the former is trapped by the nanobots, Lena is forced to deactivate them, killing Jack in the process. Breen is incarcerated and Snapper rehires Kara at CatCo for providing the Biomax story. Lena is visited by Rhea. Meanwhile, Winn brings Lyra onto the team with him and Guardian, causing tensions that lead to Lyra leaving the team. James returns her to the team with the condition that she follow his instructions. 39 19 `` Alex '' Rob Greenlea Eric Carrasco & Greg Baldwin May 1, 2017 ( 2017 - 05 - 01 ) T13. 20169 1.75 Alex is abducted by a person who demands the release of Peter Thompson, a man serving a life sentence for several felonies. The kidnapper is identified as Rick Malverne, Thompson 's son and also a childhood friend of the Danvers, having deduced Kara 's alter ego on his own. Rick is captured and taken to the DEO. Alex sends a location to Winn, but when Kara rushes to the coordinates, the trap triggers an alarm, causing water to start filling Alex 's cell. While the DEO and Kara refuse to negotiate with Rick, Maggie tries to break Thompson out of prison before being confronted by Kara, who convinces Thompson to reveal Alex 's location. Kara and Maggie manage to rescue Alex in time and Alex and Maggie profess their love for each other. J'onn decides to wipe Rick 's memory. Meanwhile, Rhea gives Lena the schematics of a high - tech device for transporting matter. Lena soon deduces that Rhea is an alien and becomes angry, but Rhea manages to convince her to continue working with her. 40 20 `` City of Lost Children '' Ben Bray Story by : Robert Rovner Teleplay by : Gabriel Llanas & Anna Musky - Goldwyn May 8, 2017 ( 2017 - 05 - 08 ) T13. 20170 1.88 James becomes discouraged with being Guardian when he realizes that those he helps are afraid of him. The DEO investigates a Phorian woman who uses her telekinetic powers to cause rampage. James tracks down her son, Marcus, who refuses to speak with anyone but James, who spends time bonding with him. With Rhea 's encouragement, Lena completes the matter transporter, which Rhea activates, causing Marcus to nearly destroy the office with his powers. Afterwards, the DEO discovers Rhea and Lena 's involvement and that Marcus 's mother 's `` attack '' was unintentional on her part. Marcus leads James and Winn to his mother, who is with a large group of Phorians. Rhea reactivates the transporter, causing the Phorians to lose control. James manages to calm Marcus, who in turn calms the others. Kara, J'onn, and Mon - El attempt to shut down the transporter, but are unsuccessful. Mon - El confronts Rhea, but hesitates to kill her. The transporter brings a massive fleet of Daxamite ships to conquer Earth and transform it into `` New Daxam ''. Rhea then teleports herself, Mon - El, and Lena to her ship. 41 21 `` Resist '' Millicent Shelton Jessica Queller & Derek Simon May 15, 2017 ( 2017 - 05 - 15 ) T13. 20171 1.93 The Daxamites launch a full invasion of National City, killing and arresting civilians. They also attack the DEO, but Alex and Winn manage to escape. Mon - El learns that he has to marry Lena in order to unite the people of Earth with Daxam. On Air Force One, Marsdin and Cat contact Rhea and demand their withdrawal, but the Daxamite fleet fires on them. Kara saves Cat and they discover that Marsdin is an alien, a refugee from the planet Durla. She tasks the DEO with destroying the Daxamite mother ship with a special cannon. Hesitant to do so, Kara turns to Cadmus for a way into the ship. Cat and Winn stage a distraction, inciting a civilian riot against the Daxamites, while Kara, Hank, and Lillian use a Phantom Zone projector to board the ship. Alex and Maggie regain control of the cannon, while the Luthors escape and try to disable the projector. Having predicted that, Supergirl is able to send Mon - El to safety and goes to confront Rhea, who reveals that she has taken control of Superman and has him attack Kara. 42 22 `` Nevertheless, She Persisted '' Glen Winter Story by : Andrew Kreisberg & Jessica Queller Teleplay by : Robert Rovner & Caitlin Parrish May 22, 2017 ( 2017 - 05 - 22 ) T13. 20172 2.12 Rhea used Silver Kryptonite to manipulate Kal 's senses, causing Kara to appear to be General Zod. Kara eventually overpowers and takes him to the Fortress, where a recovered Kal finds a way to end the invasion. Kara challenges Rhea to Dakkam Ur, a rite in which two leaders duel and the loser concedes the war, accepted by Rhea. Lillian, Lena and Winn build a device to disperse lead into the atmosphere. As lead is lethal to Daxamites, it would make the planet uninhabitable to them. With Mon - El 's approval, Kara tells the DEO to use it if she loses. During the duel, Rhea resumes the invasion. M'gann returns with other benevolent White Martians and J'onn awakens to join the battle. Rhea claims the invasion will not stop even if she loses, so Kara launches the device, killing Rhea and forcing the fleet to leave. Kara puts Mon - El in a pod and sends him away from Earth. Cat reassumes her position at CatCo and Alex asks Maggie to marry her. In deep space, Mon - El 's pod is drawn into a wormhole. In flashbacks to Krypton 's destruction, an unknown faction sends another infant to Earth in order to `` reign. '' Season 3 ( 2017 -- 18 ) No. overall No. in season Title Directed by Written by Original air date Prod. code U.S. viewers ( millions ) 43 `` Girl of Steel '' Jesse Warn Story by : Andrew Kreisberg Teleplay by : Robert Rovner & Caitlin Parrish October 9, 2017 ( 2017 - 10 - 09 ) T13. 20651 1.87 Kara has been dreaming of Mon - El and has become obsessive with her vigilantism, ignoring downtime with others in her life. Lena and James oppose industrialist Morgan Edge regarding his plan for waterfront housing estates. James is running CatCo with Cat serving as White House Press Secretary and Snapper on sabbatical. Kara quits CatCo, believing she needs to prioritize being Supergirl and pushing away Alex, who is making plans to marry Maggie. Edge hires criminal Bloodsport to attack the unveiling of a Supergirl statue by the waterfront with a submarine, forcing Kara to go underwater to stop them. When she passes out, her dream of Mon - El rallies her and she stops the attack. In order to nullify Edge 's attempts to buy CatCo and silence it, Lena buys it herself. Kara decides to return to CatCo and rejoins her friends. Meanwhile, Samantha Arias, a woman whom Alex helped at the waterfront, wakes up after a dream with a disturbing creature. 44 `` Triggers '' David McWhirter Gabriel Llanas & Anna Musky - Goldwyn October 16, 2017 ( 2017 - 10 - 16 ) T13. 20652 1.76 Kara battles a powerful metahuman bank robber called Psi, who can evoke her victims ' deepest fears, forcing Kara to struggle with her memories of Krypton 's destruction and her guilt over Mon - El. After Winn 's psychic dampener fails, Kara finally overcomes her fear and arrests Psi. Lena decides to run CatCo personally, taking James by surprise and creating friction with Kara, who initially has difficulty separating work and their friendship. Samantha Arias 's daughter, Ruby, deliberately puts herself in danger to test whether her mother has superpowers ; however, she is rescued by Kara. Samantha begins to question who she is and her origins, and becomes Lena 's replacement at L - Corp, acting as its CFO. Alex learns that Maggie seems to not want children. J'onn receives a telepathic summons from M'gann, urging him to come to Mars immediately. 45 `` Far From the Tree '' Dermott Downs Jessica Queller & Derek Simon October 23, 2017 ( 2017 - 10 - 23 ) T13. 20653 1.76 J'onn tells Kara and Alex about M'gann's message, and she convinces him to take Kara for help. The two journey to Mars in his spaceship, encountering M'gann and the `` resistance ''. They found J'onn's father, M'yrnn, who is being coerced into giving the White Martians the location of the Staff of Kolar, a psychic weapon that can defeat the resistance. J'onn rescues M'yrnn, who initially believes J'onn is a White Martian in disguise. Eventually, Kara convinces M'yrnn to let J'onn prove his identity. Having acquired the location, the resistance defeats White Martian operatives. The recovered staff is entrusted to J'onn, who returns to Earth with M'yrnn and Kara. Meanwhile, Eliza throws Alex and Maggie a bridal shower. Alex convinces Maggie to invite her father, who comes but still can not tolerate her homosexuality. She tells him that she no longer needs him because she now has a family who accepts her. However, she confirms to Alex that she does not want children. 46 `` The Faithful '' Jesse Warn Paula Yoo & Katie Rose Rogers October 30, 2017 ( 2017 - 10 - 30 ) T13. 20654 1.82 The night Kara first revealed her powers and became Supergirl, a grieving passenger, Thomas Coville, is inspired by her. In the present, Kara attends an ostensible self - help group with Winn and James and discovers a `` cult '' made up of people she previously saved. Led by Coville, they worship Supergirl and follow Kryptonian God Rao 's teachings. Those who wish to join initiate disasters so Supergirl will save them and Coville recognizes Kara in her alter - ego. The group plans to blow up a stadium filled with people, which Kara tries to stop. She finds Kryptonite inside the bomb, which she uses to wound herself and disillusion the cult. Alex gets rid of the Kryptonite and, with Coville 's help, pushes the bomb into the deep hole created by Kara 's heat vision, where it detonates. The explosion causes a being in a vessel to awaken. Coville advises Kara to follow Rao to find her path. Meanwhile, Samantha has a vision of a monstrous creature in her home, telling her she soon will `` reign ''. Alex reveals to Kara that while Maggie does not want children, she does. 47 5 `` Damage '' Kevin Smith Eric Carrasco & Cindy Lichtman November 6, 2017 ( 2017 - 11 - 06 ) T13. 20655 1.87 Several children are diagnosed with lead poisoning. Morgan publicly blames Lena 's lead device which repelled the Daxamites, causing the public to turn on her. She attempts to give a speech to defend herself, but ends up getting shot at. Kara and Sam investigate, discovering that all the affected children attended a public pool laced with a chemical which causes the same symptoms, and the manufacturer is owned by Morgan. Lena confronts Morgan alone. She is knocked unconscious and imprisoned inside a plane with barrels of the chemical, on a collision course to the city 's water supply. Lena manages to get a message to Supergirl, who rescues Lena, secures the barrels and destroys the plane. Morgan, however, covers his tracks. Maggie and Alex realize that even though they love each other, they must let each other go because they disagree on having children. Alex lets Maggie know how much she has helped Alex to become happy and accept herself. Maggie, in turn, lets Alex know how stronger she grew as a person. They part tearfully, with Maggie bringing everything full circle : `` See you around, Danvers ''. Sam discovers that she was shot during the attempt on Lena, but was not injured. 48 6 `` Midvale '' Rob Greenlea Caitlin Parrish & Jess Kardos November 13, 2017 ( 2017 - 11 - 13 ) T13. 20656 1.89 Kara and Alex arrive at Eliza 's home to help overcome their griefs, but they quarrel instead. Ten years prior, while attending Midvale High School, Alex and Kara did not get along, until a mutual friend, Kenny Li, was murdered. A photograph on his laptop revealed their teacher was in a relationship with Alex 's best friend. Kara sent the remaining encrypted files to Chloe Sullivan for decryption. After a murder attempt on Alex and Kara 's lives, the teacher was arrested, but Alex discovered an alibi for him. Kara decided to cease looking into Kenny 's death after a conversation with Noel Neill, an F.B.I. agent who strongly resembles Alura ( in reality, a disguised J'onn ). Alex went to the sheriff for help, just as Kara learned that the sheriff was involved in drug dealing and was Kenny 's killer. Kara saved Alex from being killed by the sheriff. The sisters bonded and Kara decided to not use her powers again, taking Agent Neill 's advice to embrace her new home. In the present, after recalling their first adventure together, the sisters reconcile and return to National City. 49 7 `` Wake Up '' Chad Lowe Gabriel Llanas & Anna Musky - Goldwyn November 20, 2017 ( 2017 - 11 - 20 ) T13. 20657 1.92 Kara, J'onn and Winn investigate a crashed spaceship detected beneath National City. They find Mon - El and occupied stasis tanks aboard. They take him back to the DEO ; when he attempts an escape, a suspicious Kara locks him in a cell. Mon - El convinces Winn to take him back to the ship, where the life - support systems are unstable. Kara follows them. Mon - El explains that his pod went through a wormhole, bringing him to the 31st century where L - Corp had developed a cure for Daxamites ' allergy to lead centuries before. While seven months had passed for Kara, Mon - El experienced seven years in the future. One of the tanks begins to malfunction ; Mon - El can not break it open, so Kara frees its occupant : Mon - El 's wife, Imra. J'onn decides to rent an apartment for him and M'yrnn to live together, taking the first step to restore their bond. After discovering another superhuman ability, Sam visits her foster mother and learns of her Kryptonian origins. She later travels to the `` Fortress of Sanctuary '', where a holographic artificial intelligence reveals that, while Sam 's motherhood was unexpected, her Kryptonian physiology is enhanced and she is destined to become the Worldkiller. Despite Sam 's resistance, her alternate persona -- Reign -- is triggered from her subconscious. 50 8 `` Crisis on Earth - X, Part 1 '' Larry Teng Story by : Andrew Kreisberg & Marc Guggenheim Teleplay by : Robert Rovner & Jessica Queller November 27, 2017 ( 2017 - 11 - 27 ) T13. 20658 2.71 On a parallel world, Earth - X ( Earth - 53 ), a Nazi regime rules the planet where an archer, Dark Arrow, is the Führer, and personally hunts the resistance forces. Dark Arrow seizes a temporal gateway from the Freedom Fighters members including James ' parallel universe doppelgänger, a device that allows interdimensional travel to other universes ; he schemes to invade parallel Earths with the device to spread his reign so that it may last. Kara and Alex travel to Earth - 1 to attend Barry Allen 's wedding with Iris West. Alex meets the Legends ' leader Sara Lance / White Canary, taking the first step to recover from her break up with Maggie. The wedding ceremony is interrupted by Earth - X Nazi invaders, led by Dark Arrow, his Kryptonian - powered wife Overgirl, and his partner Prometheus. After Kara defeats and injures Overgirl during the fight the Nazis retreat, and Alex and Sara capture Prometheus to interrogate. As Overgirl recuperates, she, Dark Arrow, and a yellow - clad speedster regroup and discuss their next move, Dark Arrow and Overgirl are revealed as parallel universe doppelgängers of Oliver Queen / Green Arrow and Kara, and the yellow speedster is Barry 's nemesis from the 22nd century Eobard Thawne / Reverse - Flash. This episode begins a crossover event that continues on Arrow season 6 episode 8, and concludes on The Flash season 4 episode 8 and Legends of Tomorrow season 3 episode 8. 51 9 `` Reign '' Glen Winter Paula Yoo & Caitlin Parrish December 4, 2017 ( 2017 - 12 - 04 ) T13. 20659 1.81 Samantha wakes up at home with no memory of being in a Kryptonian fortress, but finds she is oddly tired. A mysterious Kryptonian symbol, unknown to Kara, appears throughout National City, and Thomas Coville later explains to her that it is a mark of a great evil from Krypton deliberately forgotten from its society. Mon - El and Imra explain how their ship came from the future, and how the former founded the superhero team, the Legion. As Kara hosts a Christmas get - together at her apartment, Sam becomes Reign, who, as a masked vigilante, attacks random people around National City, including Edge. Reign 's rampage damages Supergirl 's reputation due to her having the same powers and similar physical attributes. Lena and James begin a relationship after an assassination attempt on Lena by Edge. When Kara decides to face Reign, they fight throughout the city ; in the process, Kara discovers that Reign is stronger than her. Though the fight clears Supergirl 's name and reveals another Kryptonian in National City, Reign eventually overpowers Kara and drops her off a building, requiring emergency medical care from the DEO. On Christmas Day, Ruby runs downstairs to find her mother, but Sam does not seem quite right. 52 10 `` Legion of Superheroes '' Jesse Warn Derek Simon & Eric Carrasco January 15, 2018 ( 2018 - 01 - 15 ) T13. 20660 2.17 Two days after Kara 's defeat by Reign, the DEO and the Legion use the latter 's technology to heal Kara from her injuries. This saves her life but she remains in a coma. The Legion 's Coluan member, Brainiac 5, enters her mind to try to wake her. Though Sam continues her life with Ruby after spending Christmas Day with her, Reign takes control over her sporadically without Sam 's knowledge, and Ruby remains unaware of her mother 's divided personality. Reign continues her rampage throughout National City, leading to a series of confrontations with the DEO and the Legion. Ultimately, Kara emerges from her coma and joins them when Reign seeks to destroy a prison facility. Kara injects Reign with a concentration dose of liquefied kryptonite, forcing the latter to retreat. Prior to Kara 's awakening, J'onn, who disguised himself as Kara to cover for her, advises Lena on her new relationship with James ; Lena sees that James is not trying to distance himself from her because of her family, but she is afraid to be with him, and they become closer afterward. Kara takes steps to move on from Mon - El after her near - death experience, and develop a friendship with Brainiac 5. As Reign recuperates in her fortress, she learns that there are other Worldkillers like her, and Coville joins her. 53 11 `` Fort Rozz '' Gregory Smith Gabriel Llanas & Anna Musky - Goldwyn January 22, 2018 ( 2018 - 01 - 22 ) T13. 20661 2.07 Samantha gets ready to go on a trip, leaving Alex to babysit Ruby. The DEO learns that a priestess with knowledge of Reign 's true mission is imprisoned in Fort Rozz, which is now drifting near a blue star, which not only strips Kara of her powers but also emits a unique type of radiation fatal to males. Unable to take any of her usual allies, Kara forms a team consisting of herself, Imra, Livewire, and Psi to conduct the search. Reign is informed of their mission and goes to intercept them. Alex helps Ruby confront a girl who cyberbullied her. The team is able to locate the priestess, but Reign kills her after she reveals the existence of two other Worldkillers, Purity and Pestilence, to Kara. Livewire sacrifices herself to save Kara 's life, while Psi uses her powers to drive off Reign. Imra 's ship begins to drift into the star, but Winn, communicating through the Voyager 2 probe, is able to save the vessel. The team returns to Earth, with Kara repaying Psi 's assistance by asking the DEO to give her better accommodations. Mon - El comforts her over Livewire 's death, considering it to be redemption for her villainous past. Prompted by a nightmare caused by Psi 's influence, Samantha asks Alex for help with her `` missing time ''. A woman named Julia Freeman is struck by a runaway car, and is seemingly killed. However, she effortlessly moves the car off her chest, revealing herself to be a Worldkiller. 54 12 `` For Good '' Tawnia McKiernan Story by : Robert Rovner Teleplay by : Cindy Lichtman & Alix Sternberg January 29, 2018 ( 2018 - 01 - 29 ) T13. 20662 2.11 Lena is poisoned by an unknown hitman ; James pursues him, but the hitman is shot down by an unseen sniper. Kara takes Lena to the DEO, where, using her powers and Alex 's medical knowledge, they are able to stabilize her. Lena and Kara gatecrash a party held by Morgan Edge, where Lena tells him that she knows he tried to kill her, and that her mother wants revenge. A drone controlled by Lillian attacks Morgan, prompting him to admit he tried to kill Lena, before Supergirl arrives. Lillian appears, wearing Lex 's exoskeleton and wounds Supergirl with a kryptonite blade. Kara and Mon - El engage in combat with Lillian until Winn hacks the drone to fire on Lillian and disable the armor. Edge tries to escape, with the recorder containing his confession, but is stopped by Guardian, allowing Lena to retrieve the recorder. Sam fears she has a brain tumor due to her memory losses and has Alex runs tests on her, but the tests come back normal. Winn, J'onn and Mon - El deduce that the Worldkillers are genetically modified to be stronger and more able to blend into the human race than conventional Kryptonians. Suspecting the Worldkillers arrived on Earth around the same time as Superman and have secret identities, Winn discovers four possible women, including Julia Freeman, whom Kara identifies. 55 13 `` Both Sides Now '' Jesse Warn Jessica Queller & Paula Yoo February 5, 2018 ( 2018 - 02 - 05 ) T13. 20663 2.12 Supergirl and the DEO converge on Julia Freeman 's home ; initially she seems normal, but her alter - ego, Purity, takes over and fights them before being subdued. Sam, on sick leave from L - Corp due to her amnesiac episodes, decides to spend time with Ruby by taking her ice skating. However, Reign takes control over Sam after Purity 's capture, and abandons Ruby to deal with the DEO. Ruby calls Lena after finding herself alone. Through Purity, Supergirl suspects that each of the Worldkillers ' personality is split, including Reign, therefore in order to stop them they need to reach their benevolent sides. When Purity escapes, despite the heroes ' attempt to recapture her, Julia regains control but Reign abducts her to the Fortress of Sanctuary to complete her transformation. When repairing the Legion 's ship, Mon - El confides to J'onn that he still loves Kara despite also loving Imra, and he did not marry her on his terms. Imra confesses to Mon - El that she and Brainiac 5 have a secret agenda on their mission. At L - Corp, Reign briefly takes control over Sam in front of Lena. The fourteenth episode is set to air on April 16, 2018, to accommodate the airing of Legends of Tomorrow 's third season in the same timeslot until April 9. Ratings Season 1 ( 2015 -- 16 ) No. Title Air date Rating / share ( 18 -- 49 ) Viewers ( millions ) DVR ( 18 -- 49 ) DVR viewers ( millions ) Total ( 18 -- 49 ) Total viewers ( millions ) `` Pilot '' October 26, 2015 3.1 / 9 12.96 1.3 3.97 4.4 16.92 `` Stronger Together '' November 2, 2015 2.2 / 7 8.87 1.0 3.33 3.2 12.20 `` Fight or Flight '' November 9, 2015 1.7 / 5 8.07 1.0 2.83 2.7 10.90 `` How Does She Do It ? '' November 23, 2015 1.5 / 5 7.19 0.8 2.26 2.3 9.45 5 `` Livewire '' November 16, 2015 1.8 / 6 7.77 0.8 N / A 2.6 N / A 6 `` Red Faced '' November 30, 2015 1.6 / 5 8.02 0.8 2.49 2.4 10.51 7 `` Human for a Day '' December 7, 2015 1.5 / 5 7.67 0.9 2.32 2.4 9.98 8 `` Hostile Takeover '' December 14, 2015 1.5 / 5 7.28 0.8 2.27 2.3 9.55 9 `` Blood Bonds '' January 4, 2016 1.9 / 6 8.75 0.7 N / A 2.6 N / A 10 `` Childish Things '' January 18, 2016 1.8 / 6 8.77 0.8 2.18 2.6 10.95 11 `` Strange Visitor from Another Planet '' January 25, 2016 1.8 / 5 7.90 0.7 2.21 2.5 10.11 12 `` Bizarro '' February 1, 2016 1.5 / 5 6.68 0.8 2.18 2.3 8.83 13 `` For the Girl Who Has Everything '' February 8, 2016 1.8 / 6 7.92 N / A N / A N / A N / A 14 `` Truth, Justice and the American Way '' February 22, 2016 1.5 / 5 7.25 N / A N / A N / A N / A 15 `` Solitude '' February 29, 2016 1.4 / 5 6.69 0.7 2.16 2.1 8.85 16 `` Falling '' March 14, 2016 1.3 / 4 6.53 0.7 N / A 2.0 N / A 17 `` Manhunter '' March 21, 2016 1.3 / 4 6.00 0.7 2.07 2.0 8.07 18 `` Worlds Finest '' March 28, 2016 1.7 / 6 7.17 0.8 2.47 2.5 9.63 19 `` Myriad '' April 11, 2016 1.3 / 5 6.12 0.7 2.04 2.0 8.16 20 `` Better Angels '' April 18, 2016 1.3 / 4 6.11 N / A N / A N / A N / A Season 2 ( 2016 -- 17 ) No. Title Air date Rating / share ( 18 -- 49 ) Viewers ( millions ) DVR ( 18 -- 49 ) DVR viewers ( millions ) Total ( 18 -- 49 ) Total viewers ( millions ) `` The Adventures of Supergirl '' October 10, 2016 1.1 / 3 3.06 N / A N / A N / A N / A `` The Last Children of Krypton '' October 17, 2016 0.9 / 3 2.66 0.6 1.42 1.5 4.08 `` Welcome to Earth '' October 24, 2016 0.8 / 3 2.65 N / A 1.37 N / A 4.03 `` Survivors '' October 31, 2016 0.6 / 2 2.22 0.6 1.59 1.2 3.80 5 `` Crossfire '' November 7, 2016 0.7 / 3 2.47 0.7 1.71 1.4 4.18 6 `` Changing '' November 14, 2016 0.7 / 3 2.35 0.6 1.42 1.3 3.85 7 `` The Darkest Place '' November 21, 2016 0.9 / 3 2.61 0.5 1.35 1.4 3.98 8 `` Medusa '' November 28, 2016 1.1 / 4 3.53 0.8 1.76 1.9 5.29 9 `` Supergirl Lives '' January 23, 2017 0.8 / 3 2.65 0.5 1.48 1.3 4.13 10 `` We Can Be Heroes '' January 30, 2017 0.7 / 3 2.35 0.5 1.40 1.2 3.75 11 `` The Martian Chronicles '' February 6, 2017 0.7 / 3 2.43 N / A 1.38 N / A 3.81 12 `` Luthors '' February 13, 2017 0.8 / 3 2.52 N / A N / A N / A N / A 13 `` Mr. & Mrs. Mxyzptlk '' February 20, 2017 0.7 / 3 2.24 N / A 1.30 N / A 3.54 14 `` Homecoming '' February 27, 2017 0.7 / 3 2.17 N / A N / A N / A N / A 15 `` Exodus '' March 6, 2017 0.7 / 3 2.16 0.5 1.28 1.2 3.46 16 `` Star - Crossed '' March 20, 2017 0.6 / 2 2.07 0.6 1.43 1.2 3.50 17 `` Distant Sun '' March 27, 2017 0.7 / 3 2.21 N / A 1.28 N / A 3.49 18 `` Ace Reporter '' April 24, 2017 0.5 / 2 1.80 N / A N / A N / A N / A 19 `` Alex '' May 1, 2017 0.5 / 2 1.75 0.4 1.26 0.9 3.00 20 `` City of Lost Children '' May 8, 2017 0.6 / 3 1.88 N / A 1.19 N / A 3.07 21 `` Resist '' May 15, 2017 0.5 / 2 1.93 0.5 1.29 1.0 3.22 22 `` Nevertheless, She Persisted '' May 22, 2017 0.6 / 2 2.12 0.5 1.19 3.31 Season 3 ( 2017 -- 18 ) No. Title Air date Rating / share ( 18 -- 49 ) Viewers ( millions ) DVR ( 18 -- 49 ) DVR viewers ( millions ) Total ( 18 -- 49 ) Total viewers ( millions ) `` Girl of Steel '' October 9, 2017 0.5 / 2 1.87 0.5 1.25 1.0 3.12 `` Triggers '' October 16, 2017 0.5 / 2 1.76 0.4 1.23 0.9 2.98 `` Far From the Tree '' October 23, 2017 0.5 / 2 1.76 0.4 1.02 0.9 2.78 `` The Faithful '' October 30, 2017 0.5 / 2 1.82 0.4 1.14 0.9 2.96 5 `` Damage '' November 6, 2017 0.5 / 2 1.87 0.5 1.14 1.0 3.01 6 `` Midvale '' November 13, 2017 0.5 / 2 1.89 0.4 1.06 0.9 2.95 7 `` Wake Up '' November 20, 2017 0.5 / 2 1.92 0.5 1.25 1.0 3.17 8 `` Crisis on Earth - X, Part 1 '' November 27, 2017 0.9 / 3 2.71 0.7 1.72 1.6 4.43 9 `` Reign '' December 4, 2017 0.5 / 2 1.81 0.4 1.13 0.9 2.94 10 `` Legion of Super-Heroes '' January 15, 2018 0.6 / 2 2.17 0.4 1.24 1.0 3.41 11 `` Fort Rozz '' January 22, 2018 0.5 / 2 2.07 0.5 1.14 1.0 3.21 12 `` For Good '' January 29, 2018 0.6 / 2 2.11 0.4 1.21 1.0 3.32 13 `` Both Sides Now '' February 5, 2018 0.6 / 2 2.12 0.4 1.10 1.0 3.22 References Jump up ^ Porter, Rick ( June 17, 2016 ). `` The CW fall TV 2016 premiere dates : ' The Flash ' and ' No Tomorrow ' kick off October rollout ''. 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Archived from the original on November 2, 2016. Retrieved November 1, 2016. ^ Jump up to : Porter, Rick ( November 8, 2016 ). `` ' Jane the Virgin ', ' Odd Couple ' and ' Conviction ' adjust down : Monday final ratings ''. TV by the Numbers. Archived from the original on November 9, 2016. Retrieved November 8, 2016. ^ Jump up to : Porter, Rick ( November 15, 2016 ). `` ' 2 Broke Girls ' adjusts up, ' Supergirl ' and ' Jane the Virgin ' adjust down : Monday final ratings ''. TV by the Numbers. Archived from the original on November 16, 2016. Retrieved November 15, 2016. ^ Jump up to : Porter, Rick ( November 22, 2016 ). `` ' Supergirl ', ' Jane the Virgin ', ' Odd Couple ', ' Conviction ' adjust down : Monday final ratings ''. TV by the Numbers. Archived from the original on November 22, 2016. Retrieved November 22, 2016. Jump up ^ Abrams, Natalie ( October 18, 2016 ). `` Arrow boss teases 100th episode, crossover catalyst ''. Entertainment Weekly. 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Jump up ^ Porter, Rick ( November 16, 2015 ). `` Broadcast Live + 7 ratings : ' Big Bang Theory ' and ' Blindspot ' top week 6, ' Quantico ' doubles in 18 -- 49 and viewers ''. TV by the Numbers. Archived from the original on November 17, 2015. Retrieved November 16, 2015. Jump up ^ Porter, Rick ( November 23, 2015 ). `` Broadcast Live + 7 ratings, week 7 : ' Elementary ' is still a strong DVR show ''. TV by the Numbers. Archived from the original on November 24, 2015. Retrieved November 23, 2015. Jump up ^ Porter, Rick ( December 1, 2015 ). `` Broadcast Live + 7 ratings, week 8 : ' Empire, ' ' Big Bang Theory ' and ' Quantico ' top charts for Nov. 9 -- 15 ''. TV by the Numbers. Archived from the original on December 3, 2015. Retrieved December 1, 2015. Jump up ^ Porter, Rick ( December 14, 2015 ). `` Broadcast Live + 7 ratings, week 10 : ' Blindspot ' is officially * the biggest gainer in Thanksgiving week ''. TV by the Numbers. Archived from the original on December 16, 2015. Retrieved December 14, 2015. Jump up ^ Porter, Rick ( December 7, 2015 ). `` Broadcast Live + 7 ratings, week 9 : ' Big Bang Theory ' makes the biggest gains ''. TV by the Numbers. Archived from the original on December 8, 2015. Retrieved December 7, 2015. Jump up ^ Porter, Rick ( December 21, 2015 ). `` Broadcast Live + 7 ratings, week 11 : ' Empire ' fall finale on top, ' Vampire Diaries ' leads percentage gains ''. TV by the Numbers. Archived from the original on December 22, 2015. Retrieved December 21, 2015. Jump up ^ Porter, Rick ( December 29, 2015 ). `` Broadcast Live + 7 ratings : ' Big Bang Theory ' gets biggest bump of the season in week 12, 5 shows double in 18 -- 49 ''. TV by the Numbers. Archived from the original on December 29, 2015. Retrieved December 29, 2015. Jump up ^ Porter, Rick ( January 5, 2016 ). `` Broadcast Live + 7 ratings : ' Big Bang Theory ' and ' Jane the Virgin ' lead a light week 13 ''. TV by the Numbers. Archived from the original on January 6, 2016. Retrieved January 5, 2016. Jump up ^ Porter, Rick ( January 25, 2016 ). `` Broadcast Live + 7 ratings : ' Shades of Blue ' premiere gets a good lift in week 16 ''. TV by the Numbers. Archived from the original on January 28, 2016. Retrieved January 25, 2016. Jump up ^ Porter, Rick ( February 8, 2016 ). `` Broadcast Live + 7 ratings : ' X-Files ' premiere dominates week 18, ' Limitless ' doubles ''. TV by the Numbers. Archived from the original on February 10, 2016. Retrieved February 8, 2016. Jump up ^ Porter, Rick ( February 16, 2016 ). `` Broadcast Live + 7 ratings : ' Lucifer ' premiere shows solid growth in week 19 ''. TV by the Numbers. Archived from the original on February 17, 2016. Retrieved February 16, 2016. Jump up ^ Porter, Rick ( February 22, 2016 ). `` Broadcast Live + 7 ratings : ' Big Bang Theory ' gains the most, ' Vampire Diaries ' and ' Shades of Blue ' double ''. TV by the Numbers. Archived from the original on February 24, 2016. Retrieved February 22, 2016. Jump up ^ Porter, Rick ( March 21, 2016 ). `` Broadcast Live + 7 ratings : ' Grey 's Anatomy, ' ' Blindspot, ' ' Jane ' and ' Quantico ' top week 24 ''. TV by the Numbers. Archived from the original on March 24, 2016. Retrieved March 21, 2016. Jump up ^ Porter, Rick ( April 5, 2016 ). `` Broadcast Live + 7 ratings : ' Modern Family ' and ' Blindspot ' gain the most for March 14 -- 20 ''. TV by the Numbers. Archived from the original on April 5, 2016. Retrieved April 5, 2016. Jump up ^ Porter, Rick ( April 11, 2016 ). `` Broadcast Live + 7 ratings : ' Modern Family ' tops the week of March 21 -- 27, 4 shows double ''. TV by the Numbers. Archived from the original on April 12, 2016. Retrieved April 11, 2016. Jump up ^ Porter, Rick ( April 18, 2016 ). `` Broadcast Live + 7 ratings : ' The Big Bang Theory ' and ' Empire ' lead the week of March 28 -- April 3 ''. TV by the Numbers. Archived from the original on April 19, 2016. Retrieved April 18, 2016. Jump up ^ Porter, Rick ( May 2, 2016 ). `` Broadcast Live + 7 ratings : ' Empire ' and ' Blacklist ' have biggest gains, 4 shows double ''. TV by the Numbers. Archived from the original on May 3, 2016. Retrieved May 2, 2016. Jump up ^ Porter, Rick ( November 4, 2016 ). `` ' This Is Us ' and ' Agents of SHIELD ' score in broadcast Live + 7 ratings for Oct. 17 -- 23 ''. TV by the Numbers. Archived from the original on November 5, 2016. Retrieved November 4, 2016. Jump up ^ Porter, Rick ( November 10, 2016 ). `` ' This Is Us, ' ' Designated Survivor ' stay on top in broadcast Live + 7 ratings for Oct. 24 -- 30 ''. TV by the Numbers. Archived from the original on November 11, 2016. Retrieved November 10, 2016. Jump up ^ Porter, Rick ( November 17, 2016 ). `` 13 shows double, ' This Is Us ' & ' Big Bang ' lead broadcast Live + 7 ratings for Oct. 31 - Nov. 6 ''. TV by the Numbers. Archived from the original on November 18, 2016. Retrieved November 17, 2016. Jump up ^ Porter, Rick ( November 23, 2016 ). `` ' Designated Survivor ' makes more big gains in week 8 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on November 24, 2016. Retrieved November 23, 2016. Jump up ^ Porter, Rick ( December 1, 2016 ). `` ' This Is Us, ' ' Big Bang, ' ' Designated Survivor ' are the Big Three in week 9 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on December 1, 2016. Retrieved December 1, 2016. Jump up ^ Porter, Rick ( December 7, 2016 ). `` ' New Girl ' and ' Quantico ' double in week 10 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on December 8, 2016. Retrieved December 7, 2016. Jump up ^ Porter, Rick ( December 21, 2016 ). `` 6 shows double in week 11 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on December 22, 2016. Retrieved December 21, 2016. Jump up ^ Porter, Rick ( February 11, 2017 ). `` ' This Is Us ' and TGIT rise above the rest in week 19 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on February 11, 2017. Retrieved February 11, 2017. Jump up ^ Porter, Rick ( February 15, 2017 ). `` ' Big Bang Theory, ' ' Agents of SHIELD ' benefit the most in week 20 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on February 16, 2017. Retrieved February 15, 2017. Jump up ^ Porter, Rick ( February 23, 2017 ). `` ' This Is Us ' and ' Timeless ' lead the week 21 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on February 24, 2017. Retrieved February 23, 2017. Jump up ^ Porter, Rick ( March 9, 2017 ). `` ' This Is Us ' makes biggest gains again : Week 23 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on March 10, 2017. Retrieved March 9, 2017. Jump up ^ Porter, Rick ( March 24, 2017 ). `` ' Sleepy Hollow ' & 5 more shows double, ' This Is Us ' has biggest total gain : Week 25 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on March 24, 2017. Retrieved March 24, 2017. Jump up ^ Porter, Rick ( April 6, 2017 ). `` ' Empire ' and ' Designated Survivor ' score in week 27 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on April 7, 2017. Retrieved April 6, 2017. Jump up ^ Porter, Rick ( April 13, 2017 ). `` ' Designated Survivor ' scores again, 7 shows double in week 28 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on April 14, 2017. Retrieved April 13, 2017. Jump up ^ Porter, Rick ( May 22, 2017 ). `` ' Modern Family, ' ' Big Bang ' gain the most, 10 shows double : Week 33 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on May 22, 2017. Retrieved May 22, 2017. Jump up ^ Porter, Rick ( May 27, 2017 ). `` ' Designated Survivor, ' ' Big Bang Theory ' finale lead week 34 's broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on May 27, 2017. Retrieved May 27, 2017. Jump up ^ Porter, Rick ( June 2, 2017 ). `` ' Modern Family, ' ' Designated Survivor ' finales make biggest gains in week 35 broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on June 2, 2017. Retrieved June 2, 2017. Jump up ^ Porter, Rick ( June 8, 2017 ). `` ' Empire ' and ' Bull ' season finales lead week 36 's broadcast Live + 7 ratings ''. TV by the Numbers. Archived from the original on June 8, 2017. Retrieved June 8, 2017. Jump up ^ Porter, Rick ( October 25, 2017 ). `` ' The Good Doctor ' is the most - watched show on TV in week 3 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved October 25, 2017. Jump up ^ Porter, Rick ( November 2, 2017 ). `` ' Chicago PD, ' 10 more shows double in week 4 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved November 2, 2017. Jump up ^ Porter, Rick ( November 9, 2017 ). `` ' Grey 's Anatomy ' keeps rolling along in week 5 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved November 9, 2017. Jump up ^ Porter, Rick ( November 17, 2017 ). `` ' This Is Us ' and 12 more shows double in week 6 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved November 17, 2017. Jump up ^ Porter, Rick ( November 27, 2017 ). `` ' This Is Us ' rides high in week 7 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved November 27, 2017. Jump up ^ Porter, Rick ( December 5, 2017 ). `` ' Jane the Virgin, ' 10 other shows double in week 8 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved December 5, 2017. Jump up ^ Porter, Rick ( December 7, 2017 ). `` ' Chicago Med ' premiere makes solid gains in week 9 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved December 7, 2017. Jump up ^ Porter, Rick ( December 15, 2017 ). `` CW crossovers get another bump in week 10 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved December 15, 2017. Jump up ^ Porter, Rick ( December 21, 2017 ). `` ' Agents of SHIELD ' gets a good bump in week 11 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved December 21, 2017. Jump up ^ Porter, Rick ( February 1, 2018 ). `` ' This Is Us, ' ' The Good Doctor ' both double in week 17 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved February 1, 2018. Jump up ^ Porter, Rick ( February 8, 2018 ). `` ' This Is Us ' sets NBC records in week 18 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved February 8, 2018. Jump up ^ Porter, Rick ( February 15, 2018 ). `` Closing the book on the Super Bowl ' This Is Us ' : Week 19 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved February 15, 2018. Jump up ^ Porter, Rick ( February 22, 2018 ). `` ' The Good Doctor ' and ' This Is Us ' on top again : Week 20 broadcast Live + 7 ratings ''. TV by the Numbers. Retrieved February 22, 2018. General references `` Shows A-Z -- supergirl on cw ''. The Futon Critic. Retrieved September 2, 2016. Supergirl Otto Binder Al Plastino Curt Swan Versions Kara Zor - El Matrix Linda Danvers Cir - El Laurel Gand Power Girl Ariella Kent Characters Supporting Cat Grant Comet Lana Lang Lena Luthor Lucy Lane Mary Marvel Maxima Streaky the Supercat Superman Zor - El Enemies Blithe The Council Cyborg Superman Decay Lesla - Lar Reactron Silver Banshee Twilight Titles Adventure Comics Supergirl Supergirl and the Legion of Super-Heroes Superman Family Elseworld 's Finest : Supergirl & Batgirl Other media Film Supergirl ( 1984 ) Superman / Batman : Apocalypse ( 2010 ) Superman : Unbound ( 2013 ) Television Superman : The Animated Series ( 1996 ) episodes Smallville ( 2001 ) characters episodes Supergirl ( 2015 ) characters episodes DC Super Hero Girls ( 2015 ) Arrowverse Arrow Episodes Season 1 Season 2 `` Pilot '' `` Green Arrow '' `` Unchained '' `` Sins of the Father '' `` Legacy '' `` Kapiushon '' `` Lian Yu '' Characters Oliver Queen Thea Queen Sara Lance The Flash Episodes Season 4 `` Pilot '' `` Fastest Man Alive '' `` Things You Ca n't Outrun '' `` Killer Frost '' `` Attack on Gorilla City '' `` Attack on Central City '' `` Duet '' Characters Supergirl Episodes `` Pilot '' `` Stronger Together '' `` Fight or Flight '' `` Livewire '' `` How Does She Do It ? 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Question: when is the next supergirl episode coming out
Answer: April 16, 2018