Season 4 (Supergirl)

The fourth season of ​​​​​ premiered on October 14, 2018 on The CW and concluded on May 10, 2019. The season consisted of 22 episodes.
==Cast==
===Main cast===
*Melissa Benoist as Kara Danvers/Supergirl and Red Daughter
*Mehcad Brooks as James Olsen/Guardian and Jimmy
*Chyler Leigh as Dr./Director Alex Danvers and Alex Danvers
*Katie McGrath as Lena Luthor
*Jesse Rath as Querl Dox/Brainiac 5
*Sam Witwer as Professor Ben Lockwood/Agent Liberty
*Nicole Maines as Nia Nal/Dreamer
*April Parker Jones as Colonel Lauren Haley
*David Harewood as J'onn J'onzz/Martian Manhunter
===Recurring cast===
*Lynda Carter as President Olivia Marsdin
*Jon Cryer as Lex Luthor
*Brenda Strong as Dr. Lillian Luthor
*Rhona Mitra as Mercy Graves
*Robert Baker as Otis Graves/Metallo
*Tiya Sircar as Fiona Byrne
*Anthony Konechny as Raymond Jensen/Parasite
*Jaymee Mak as Mackenzie
*Bruce Boxleitner as Vice President/President Phil Baker
*Andrea Brooks as Eve Teschmacher
*Sarah Smyth as Lydia Lockwood
*Graham Verchere as George Lockwood
*David Ajala as Manchester Black
*Donna Benedicto as Agent Reiff
*Steve Byers as Tom
*Roxy Wood as Yvette
*Jessica Meraz as Pamela Ferrer/Menagerie
*Louis Ozawa Changchien as Hat
*Azie Tesfai as Dr. Kelly Olsen
*Françoise Robertson as Sarah Walker
==Episodes==
1 	 	Jesse Warn 	Robert Rovner & Jessica Queller 	Gabriel Llanas & Aadrita Mukerji 	October 14, 2018
Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the D.E.O.. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn relishes his peaceful new life, but an outing with an old friend causes him concern. 	Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the D.E.O.. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn relishes his peaceful new life, but an outing with an old friend causes him concern. 	Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the D.E.O.. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn relishes his peaceful new life, but an outing with an old friend causes him concern. 	Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the D.E.O.. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn relishes his peaceful new life, but an outing with an old friend causes him concern. 	Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the D.E.O.. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn relishes his peaceful new life, but an outing with an old friend causes him concern. 	Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James' impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the D.E.O.. Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J'onn relishes his peaceful new life, but an outing with an old friend causes him concern.
2 	 	Harry Jierjian 	Dana Horgan 	Maria Maggenti & Daniel Beaty 	October 21, 2018
A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the D.E.O.. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation. 	A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the D.E.O.. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation. 	A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the D.E.O.. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation. 	A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the D.E.O.. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation. 	A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the D.E.O.. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation. 	A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the D.E.O.. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation.
3 	 	Jesse Warn 	Rob Wright & Derek Simon 	Rob Wright & Derek Simon 	October 28, 2018
Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today. 	Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today. 	Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today. 	Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today. 	Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today. 	Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today.
4 	 	Armen Kevorkian 	Eric Carrasco 	Katie Rose Rogers & Jess Kardos 	November 4, 2018
When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the D.E.O., but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens. 	When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the D.E.O., but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens. 	When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the D.E.O., but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens. 	When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the D.E.O., but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens. 	When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the D.E.O., but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens. 	When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the D.E.O., but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens.
5 	 	David McWhirter 	Maria Maggenti & Aadrita Mukerji 	Maria Maggenti & Aadrita Mukerji 	November 11, 2018
Colonel Haley makes a surprising decision regarding Supergirl. Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm's way. 	Colonel Haley makes a surprising decision regarding Supergirl. Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm's way. 	Colonel Haley makes a surprising decision regarding Supergirl. Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm's way. 	Colonel Haley makes a surprising decision regarding Supergirl. Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm's way. 	Colonel Haley makes a surprising decision regarding Supergirl. Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm's way. 	Colonel Haley makes a surprising decision regarding Supergirl. Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the article puts some of the aliens in harm's way.
6 	 	Antonio Negret 	Gabriel Llanas & Daniel Beaty 	Gabriel Llanas & Daniel Beaty 	November 18, 2018
Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty. 	Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty. 	Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty. 	Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty. 	Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty. 	Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty.
7 	 	Chad Lowe 	Dana Horgan & Katie Rose Rogers 	Dana Horgan & Katie Rose Rogers 	November 25, 2018
James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty's location, but things take a dark turn. Lena kicks off her first set of trials. 	James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty's location, but things take a dark turn. Lena kicks off her first set of trials. 	James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty's location, but things take a dark turn. Lena kicks off her first set of trials. 	James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty's location, but things take a dark turn. Lena kicks off her first set of trials. 	James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty's location, but things take a dark turn. Lena kicks off her first set of trials. 	James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty's location, but things take a dark turn. Lena kicks off her first set of trials.
8 	 	Kevin Smith 	Rob Wright & Eric Carrasco 	Rob Wright & Eric Carrasco 	December 2, 2018
Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit. 	Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit. 	Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit. 	Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit. 	Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit. 	Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit.
9 	 	Jesse Warn 	Marc Guggenheim 	Derek Simon & Robert Rovner 	December 11, 2018
Supergirl, the Flash, Green Arrow and Superman engage in the battle of their lives. 	Supergirl, the Flash, Green Arrow and Superman engage in the battle of their lives. 	Supergirl, the Flash, Green Arrow and Superman engage in the battle of their lives. 	Supergirl, the Flash, Green Arrow and Superman engage in the battle of their lives. 	Supergirl, the Flash, Green Arrow and Superman engage in the battle of their lives. 	Supergirl, the Flash, Green Arrow and Superman engage in the battle of their lives.
10 	 	Rachel Talalay 	Maria Maggenti & Gabriel Llanas 	Maria Maggenti & Gabriel Llanas 	January 20, 2019
Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl's true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives. 	Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl's true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives. 	Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl's true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives. 	Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl's true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives. 	Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl's true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives. 	Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl's true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives.
11 	 	Shannon Kohli 	Jessica Queller & Dana Horgan 	Jessica Queller & Dana Horgan 	January 27, 2019
Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother (guest star Kate Burton) encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers. 	Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother (guest star Kate Burton) encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers. 	Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother (guest star Kate Burton) encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers. 	Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother (guest star Kate Burton) encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers. 	Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother (guest star Kate Burton) encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers. 	Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother (guest star Kate Burton) encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers.
12 	 	Stefan Pleszczynski 	Robert Rovner 	Daniel Beaty & Greg Baldwin 	February 17, 2019
With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the D.E.O., Kara decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's current investigation that involves the villain Menagerie (guest star Jessica Meraz). Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party. 	With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the D.E.O., Kara decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's current investigation that involves the villain Menagerie (guest star Jessica Meraz). Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party. 	With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the D.E.O., Kara decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's current investigation that involves the villain Menagerie (guest star Jessica Meraz). Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party. 	With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the D.E.O., Kara decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's current investigation that involves the villain Menagerie (guest star Jessica Meraz). Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party. 	With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the D.E.O., Kara decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's current investigation that involves the villain Menagerie (guest star Jessica Meraz). Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party. 	With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the D.E.O., Kara decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's current investigation that involves the villain Menagerie (guest star Jessica Meraz). Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party.
13 	 	Alexis Ostrander 	Eric Carrasco & Aadrita Mukerji 	Eric Carrasco & Aadrita Mukerji 	March 3, 2019
Manchester Black breaks out of prison with the help of his new team, the Elite, who are set on punishing the anti-alien forces. Supergirl pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood. 	Manchester Black breaks out of prison with the help of his new team, the Elite, who are set on punishing the anti-alien forces. Supergirl pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood. 	Manchester Black breaks out of prison with the help of his new team, the Elite, who are set on punishing the anti-alien forces. Supergirl pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood. 	Manchester Black breaks out of prison with the help of his new team, the Elite, who are set on punishing the anti-alien forces. Supergirl pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood. 	Manchester Black breaks out of prison with the help of his new team, the Elite, who are set on punishing the anti-alien forces. Supergirl pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood. 	Manchester Black breaks out of prison with the help of his new team, the Elite, who are set on punishing the anti-alien forces. Supergirl pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood.
14 	 	Andi Armaganian 	Rob Wright & Jess Kardos 	Rob Wright & Jess Kardos 	March 10, 2019
Between Ben Lockwood's new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his minions, Supergirl is concerned about the safety of the American people – both human and alien. When Lockwood organizes a rally, the aliens decide to peacefully protest. Brainiac and J’onn join the alien march while Supergirl and Dreamer patrol to keep everyone safe. Meanwhile, James picks up his camera again to cover the march for CatCo, and Hayley assigns Alex a job that clashes with her beliefs. When the Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand.	Between Ben Lockwood's new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his minions, Supergirl is concerned about the safety of the American people – both human and alien. When Lockwood organizes a rally, the aliens decide to peacefully protest. Brainiac and J’onn join the alien march while Supergirl and Dreamer patrol to keep everyone safe. Meanwhile, James picks up his camera again to cover the march for CatCo, and Hayley assigns Alex a job that clashes with her beliefs. When the Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand.	Between Ben Lockwood's new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his minions, Supergirl is concerned about the safety of the American people – both human and alien. When Lockwood organizes a rally, the aliens decide to peacefully protest. Brainiac and J’onn join the alien march while Supergirl and Dreamer patrol to keep everyone safe. Meanwhile, James picks up his camera again to cover the march for CatCo, and Hayley assigns Alex a job that clashes with her beliefs. When the Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand.	Between Ben Lockwood's new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his minions, Supergirl is concerned about the safety of the American people – both human and alien. When Lockwood organizes a rally, the aliens decide to peacefully protest. Brainiac and J’onn join the alien march while Supergirl and Dreamer patrol to keep everyone safe. Meanwhile, James picks up his camera again to cover the march for CatCo, and Hayley assigns Alex a job that clashes with her beliefs. When the Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand.	Between Ben Lockwood's new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his minions, Supergirl is concerned about the safety of the American people – both human and alien. When Lockwood organizes a rally, the aliens decide to peacefully protest. Brainiac and J’onn join the alien march while Supergirl and Dreamer patrol to keep everyone safe. Meanwhile, James picks up his camera again to cover the march for CatCo, and Hayley assigns Alex a job that clashes with her beliefs. When the Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand.	Between Ben Lockwood's new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his minions, Supergirl is concerned about the safety of the American people – both human and alien. When Lockwood organizes a rally, the aliens decide to peacefully protest. Brainiac and J’onn join the alien march while Supergirl and Dreamer patrol to keep everyone safe. Meanwhile, James picks up his camera again to cover the march for CatCo, and Hayley assigns Alex a job that clashes with her beliefs. When the Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand.
15 	 	Tawnia McKiernan 	Derek Simon & Nicki Holcomb 	Derek Simon & Nicki Holcomb 	March 17, 2019
Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she's faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James’ sister Kelly comes to town. 	Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she's faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James’ sister Kelly comes to town. 	Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she's faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James’ sister Kelly comes to town. 	Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she's faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James’ sister Kelly comes to town. 	Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she's faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James’ sister Kelly comes to town. 	Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she's faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James’ sister Kelly comes to town.
16 	 	Carl Seaton 	Dana Horgan & Eric Carrasco 	Dana Horgan & Eric Carrasco 	March 24, 2019
In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena. 	In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena. 	In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena. 	In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena. 	In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena. 	In the wake of Lex Luthor's return, the show flashes back to what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena.
17 	 	Ben Bray 	Gabriel Llanas 	Katie Rose Rogers & Brooke Pohl 	March 31, 2019
Supergirl must deal with the destructive aftermath of Lex’s nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet. 	Supergirl must deal with the destructive aftermath of Lex’s nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet. 	Supergirl must deal with the destructive aftermath of Lex’s nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet. 	Supergirl must deal with the destructive aftermath of Lex’s nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet. 	Supergirl must deal with the destructive aftermath of Lex’s nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet. 	Supergirl must deal with the destructive aftermath of Lex’s nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet.
18 	 	Antonio Negret 	Rob Wright 	Lindsay Sturman & Aadrita Mukerji 	April 21, 2019
Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly encourages James to talk to someone for his PTSD, and Alex faces off against Ben Lockwood after he storms the D.E.O. and acquires some powerful weapons to hunt Supergirl. 	Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly encourages James to talk to someone for his PTSD, and Alex faces off against Ben Lockwood after he storms the D.E.O. and acquires some powerful weapons to hunt Supergirl. 	Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly encourages James to talk to someone for his PTSD, and Alex faces off against Ben Lockwood after he storms the D.E.O. and acquires some powerful weapons to hunt Supergirl. 	Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly encourages James to talk to someone for his PTSD, and Alex faces off against Ben Lockwood after he storms the D.E.O. and acquires some powerful weapons to hunt Supergirl. 	Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly encourages James to talk to someone for his PTSD, and Alex faces off against Ben Lockwood after he storms the D.E.O. and acquires some powerful weapons to hunt Supergirl. 	Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly encourages James to talk to someone for his PTSD, and Alex faces off against Ben Lockwood after he storms the D.E.O. and acquires some powerful weapons to hunt Supergirl.
19 	 	David Harewood 	Dana Horgan 	Daniel Beaty & Jess Kardos 	April 28, 2019
As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City’s protector, which leads to a showdown with Ben Lockwood. James takes drastic measures to relieve his PTSD. 	As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City’s protector, which leads to a showdown with Ben Lockwood. James takes drastic measures to relieve his PTSD. 	As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City’s protector, which leads to a showdown with Ben Lockwood. James takes drastic measures to relieve his PTSD. 	As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City’s protector, which leads to a showdown with Ben Lockwood. James takes drastic measures to relieve his PTSD. 	As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City’s protector, which leads to a showdown with Ben Lockwood. James takes drastic measures to relieve his PTSD. 	As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City’s protector, which leads to a showdown with Ben Lockwood. James takes drastic measures to relieve his PTSD.
20 	 	Shannon Kohli 	Derek Simon 	Katie Rose Rogers & Natalie Abrams 	May 5, 2019
Kara and Lena head to Kaznia to hunt down Lex. However, Eve Teschmacher sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awaited phone call, James practices using his powers, and Ben Lockwood takes a dangerous stand inside the D.E.O.. 	Kara and Lena head to Kaznia to hunt down Lex. However, Eve Teschmacher sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awaited phone call, James practices using his powers, and Ben Lockwood takes a dangerous stand inside the D.E.O.. 	Kara and Lena head to Kaznia to hunt down Lex. However, Eve Teschmacher sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awaited phone call, James practices using his powers, and Ben Lockwood takes a dangerous stand inside the D.E.O.. 	Kara and Lena head to Kaznia to hunt down Lex. However, Eve Teschmacher sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awaited phone call, James practices using his powers, and Ben Lockwood takes a dangerous stand inside the D.E.O.. 	Kara and Lena head to Kaznia to hunt down Lex. However, Eve Teschmacher sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awaited phone call, James practices using his powers, and Ben Lockwood takes a dangerous stand inside the D.E.O.. 	Kara and Lena head to Kaznia to hunt down Lex. However, Eve Teschmacher sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awaited phone call, James practices using his powers, and Ben Lockwood takes a dangerous stand inside the D.E.O..
21 	 	Alexis Ostrander 	Lindsay Sturman 	Gabriel Llanas & Eric Carrasco 	May 12, 2019
Kara comes face-to-face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor. Meanwhile, Alex realizes she's missing parts of her memory, & Brainy, Nia & J’onn set out to track down aliens who've been abducted by Lex. 	Kara comes face-to-face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor. Meanwhile, Alex realizes she's missing parts of her memory, & Brainy, Nia & J’onn set out to track down aliens who've been abducted by Lex. 	Kara comes face-to-face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor. Meanwhile, Alex realizes she's missing parts of her memory, & Brainy, Nia & J’onn set out to track down aliens who've been abducted by Lex. 	Kara comes face-to-face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor. Meanwhile, Alex realizes she's missing parts of her memory, & Brainy, Nia & J’onn set out to track down aliens who've been abducted by Lex. 	Kara comes face-to-face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor. Meanwhile, Alex realizes she's missing parts of her memory, & Brainy, Nia & J’onn set out to track down aliens who've been abducted by Lex. 	Kara comes face-to-face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor. Meanwhile, Alex realizes she's missing parts of her memory, & Brainy, Nia & J’onn set out to track down aliens who've been abducted by Lex.
22 	 	Jesse Warn 	Robert Rovner & Jessica Queller 	Rob Wright & Derek Simon 	May 19, 2019
Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the press to help her. 	Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the press to help her. 	Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the press to help her. 	Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the press to help her. 	Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the press to help her. 	Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one last chance to stop Lex and turns to the power of the press to help her.
==Trivia==
*This season airs on Sundays at 8/7c, as opposed to the past three seasons that aired on Mondays at 8/7c.
*Manchester Black was originally going to be the main antagonist of this season.https://www.denofgeek.com/us/tv/supergirl/275081/supergirl-season-4-villain-revealed
*Jeremy Jordan was supposed to appear as a recurring role this season, but was unable to.https://comicbook.com/dc/2019/01/19/supergirl-jeremy-jordan-winn-not-returning-season-4/ He would return in the fifth season.
**This is the first and only season without Jeremy Jordan (Winn Schott) being featured in any shape, as he appeared as special guest stars in season 5 and 6.
*This is the final season with more than 20 episodes since the COVID-19 pandemic halted Season 5's filming and the final season will have only 20 episodes.
*Season 4 marks Jesse Rath and Nicole Maines' first in addition to being the only season for Sam Witwer and April Parker Jones whose credited from onwards. It is also the first season to be fully run by Jessica Queller and Robert Rovner.
==Gallery==
===Title cards===
Supergirl season 4 title card.png|Title card
Elseworlds, Part 3 title card.png|Variant title card for .
The House of L title card.png|Variant title card for , and .
The House of L end title card.png|Variant end title card for and .
====Promotional images====
Supergirl season 4 key art.png|Key art
Season 4 official poster.png|"A Force Against Fear"
Dreamer first look.png|First look at Nia Nal as Dreamer.
Lex Luthor first look.png|First look at Jon Cryer as Lex Luthor.
===Videos===
SUPERGIRL Season 4 Comic-Con Trailer (HD)
Supergirl Season 4 "Super Sunday" Promo (HD)
Supergirl Season 4 "American Alien" Promo (HD) Moves to Sundays
The CW Sundays - Supergirl and Charmed Teaser Promo (HD)
==References==
es:Temporada 4 (Supergirl)
fr:Saison 4 (Supergirl)
pl:Sezon 4 (Supergirl)
pt-br:4ª Temporada (Supergirl)