Season 4 (Arrow)

The fourth season of premiered on October 7, 2015, on The CW and concluded on May 25, 2016. The season consisted of 23 episodes.
==Synopsis==
==Cast==
===Main cast===
*Stephen Amell as Oliver Queen/Green Arrow
*Katie Cassidy as Laurel Lance/Black Canary
*David Ramsey as John Diggle/Spartan
*Willa Holland as Thea Queen/Speedy
*Emily Bett Rickards as Felicity Smoak/Overwatch
*John Barrowman as Malcolm Merlyn/Dark Archer
*Paul Blackthorne as Quentin Lance
===Recurring cast===
*Neal McDonough as Damien Darhk
*Alex Kingston as Dinah Lance
*Adrian Holmes as Frank Pike
*Cynthia Addai-Robinson as Amanda Waller
*Audrey Marie Anderson as Lyla Michaels
*Katrina Law as Nyssa al Ghul
*Charlotte Ross as Donna Smoak
*Rila Fukushima as Tatsu Yamashiro/Katana
*Amy Gumenick as Carrie Cutter/Cupid
*Echo Kellum as Curtis Holt
*Jimmy Akingbola as Baron Reiter
*Ryan Robbins as Conklin
*Parker Young as Alex Davis
*Elysia Rotaru as Taiana Venediktov
*Eugene Byrd as Andy Diggle
*Tom Amandes as Noah Kuttler/The Calculator
*Alexander Calvert as Lonnie Machin/Anarky
*Adrian Glynn McMorran as Michael Amar/Murmur
*Janet Kidder as Ruvé Adams
*James Kidnie as Milo Armitage
*Venus Terzo as Dr. Elisa Schwartz
*Lynda Boyd as Phaedra Nixon
==Episodes==
1 	 	Thor Freudenthal 	Greg Berlanti & Beth Schwartz 	Marc Guggenheim & Wendy Mericle 	October 7, 2015
Oliver and Felicity's blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by "Ghosts", assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn't want Oliver on the team. 	Oliver and Felicity's blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by "Ghosts", assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn't want Oliver on the team. 	Oliver and Felicity's blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by "Ghosts", assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn't want Oliver on the team. 	Oliver and Felicity's blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by "Ghosts", assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn't want Oliver on the team. 	Oliver and Felicity's blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by "Ghosts", assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn't want Oliver on the team. 	Oliver and Felicity's blissful getaway is cut short when Thea and Laurel pay them a visit and tell Oliver they need his help back in Star City. The city has been attacked by "Ghosts", assassins led by a dangerous man named Damien Darhk. However, when Oliver returns, Diggle makes it very clear that he doesn't want Oliver on the team.
2 	 	John Behring 	Marc Guggenheim & Keto Shimizu 	Marc Guggenheim & Keto Shimizu 	October 14, 2015
When an old family friend, Jessica Danforth, tells Oliver and Thea that she is going to run for mayor, both Queens are concerned considering the last three mayors have been murdered. Despite their protests, Jessica makes her announcement so the Green Arrow and Speedy vow to protect her. Meanwhile, Thea begins to exhibit effects from the Lazarus Pit. In addition, Felicity is faced with a tough business decision and looks to one of her employees, Curtis Holt, for help.	When an old family friend, Jessica Danforth, tells Oliver and Thea that she is going to run for mayor, both Queens are concerned considering the last three mayors have been murdered. Despite their protests, Jessica makes her announcement so the Green Arrow and Speedy vow to protect her. Meanwhile, Thea begins to exhibit effects from the Lazarus Pit. In addition, Felicity is faced with a tough business decision and looks to one of her employees, Curtis Holt, for help.	When an old family friend, Jessica Danforth, tells Oliver and Thea that she is going to run for mayor, both Queens are concerned considering the last three mayors have been murdered. Despite their protests, Jessica makes her announcement so the Green Arrow and Speedy vow to protect her. Meanwhile, Thea begins to exhibit effects from the Lazarus Pit. In addition, Felicity is faced with a tough business decision and looks to one of her employees, Curtis Holt, for help.	When an old family friend, Jessica Danforth, tells Oliver and Thea that she is going to run for mayor, both Queens are concerned considering the last three mayors have been murdered. Despite their protests, Jessica makes her announcement so the Green Arrow and Speedy vow to protect her. Meanwhile, Thea begins to exhibit effects from the Lazarus Pit. In addition, Felicity is faced with a tough business decision and looks to one of her employees, Curtis Holt, for help.	When an old family friend, Jessica Danforth, tells Oliver and Thea that she is going to run for mayor, both Queens are concerned considering the last three mayors have been murdered. Despite their protests, Jessica makes her announcement so the Green Arrow and Speedy vow to protect her. Meanwhile, Thea begins to exhibit effects from the Lazarus Pit. In addition, Felicity is faced with a tough business decision and looks to one of her employees, Curtis Holt, for help.	When an old family friend, Jessica Danforth, tells Oliver and Thea that she is going to run for mayor, both Queens are concerned considering the last three mayors have been murdered. Despite their protests, Jessica makes her announcement so the Green Arrow and Speedy vow to protect her. Meanwhile, Thea begins to exhibit effects from the Lazarus Pit. In addition, Felicity is faced with a tough business decision and looks to one of her employees, Curtis Holt, for help.
3 	 	Wendey Stanzler 	Wendy Mericle & Speed Weed 	Wendy Mericle & Speed Weed 	October 21, 2015
The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit. However, Laurel is surprised when Nyssa refuses to do it. 	The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit. However, Laurel is surprised when Nyssa refuses to do it. 	The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit. However, Laurel is surprised when Nyssa refuses to do it. 	The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit. However, Laurel is surprised when Nyssa refuses to do it. 	The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit. However, Laurel is surprised when Nyssa refuses to do it. 	The growing tension between Oliver and Diggle puts both their lives at risk when they go after Damien Darhk and a H.I.V.E. deployed meta-human. Meanwhile, Laurel talks Thea into returning to Nanda Parbat to ask her father to put Sara into the Lazarus Pit. However, Laurel is surprised when Nyssa refuses to do it.
4 	 	Lexi Alexander 	Beth Schwartz & Ben Sokolowski 	Beth Schwartz & Ben Sokolowski 	October 28, 2015
Laurel must deal with the repercussions of taking Sara to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor and while he's not surprised at the response, he is surprised at what he finds out next. 	Laurel must deal with the repercussions of taking Sara to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor and while he's not surprised at the response, he is surprised at what he finds out next. 	Laurel must deal with the repercussions of taking Sara to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor and while he's not surprised at the response, he is surprised at what he finds out next. 	Laurel must deal with the repercussions of taking Sara to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor and while he's not surprised at the response, he is surprised at what he finds out next. 	Laurel must deal with the repercussions of taking Sara to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor and while he's not surprised at the response, he is surprised at what he finds out next. 	Laurel must deal with the repercussions of taking Sara to Nanda Parbat. Meanwhile, Oliver asks Captain Lance for a favor and while he's not surprised at the response, he is surprised at what he finds out next.
5 	 	John Badham 	Brian Ford Sullivan & Oscar Balderrama 	Brian Ford Sullivan & Oscar Balderrama 	November 4, 2015
When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine. 	When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine. 	When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine. 	When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine. 	When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine. 	When things take a turn for the worse with Sara, Oliver calls in a favor from an old friend who deals in the mystical, John Constantine.
6 	 	Antonio Negret 	Beth Schwartz & Emilio Ortega Aldrich 	Beth Schwartz & Emilio Ortega Aldrich 	November 11, 2015
Felicity is frantic when she learns that Ray is alive and being held by Damien Darhk. Felicity's guilt over not finding Ray sooner causes tension between her and Oliver. Meanwhile, Sara joins Laurel, Thea and the team on a rescue mission for Ray. However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation. Donna Smoak returns to Star City. 	Felicity is frantic when she learns that Ray is alive and being held by Damien Darhk. Felicity's guilt over not finding Ray sooner causes tension between her and Oliver. Meanwhile, Sara joins Laurel, Thea and the team on a rescue mission for Ray. However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation. Donna Smoak returns to Star City. 	Felicity is frantic when she learns that Ray is alive and being held by Damien Darhk. Felicity's guilt over not finding Ray sooner causes tension between her and Oliver. Meanwhile, Sara joins Laurel, Thea and the team on a rescue mission for Ray. However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation. Donna Smoak returns to Star City. 	Felicity is frantic when she learns that Ray is alive and being held by Damien Darhk. Felicity's guilt over not finding Ray sooner causes tension between her and Oliver. Meanwhile, Sara joins Laurel, Thea and the team on a rescue mission for Ray. However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation. Donna Smoak returns to Star City. 	Felicity is frantic when she learns that Ray is alive and being held by Damien Darhk. Felicity's guilt over not finding Ray sooner causes tension between her and Oliver. Meanwhile, Sara joins Laurel, Thea and the team on a rescue mission for Ray. However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation. Donna Smoak returns to Star City. 	Felicity is frantic when she learns that Ray is alive and being held by Damien Darhk. Felicity's guilt over not finding Ray sooner causes tension between her and Oliver. Meanwhile, Sara joins Laurel, Thea and the team on a rescue mission for Ray. However, the effects of the Lazarus Pit take over and threaten to jeopardize the entire operation. Donna Smoak returns to Star City.
7 	 	James Bamford 	Speed Weed & Keto Shimizu 	Speed Weed & Keto Shimizu 	November 18, 2015
Team Green Arrow's ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea's bloodlust returns and she loses control in front of Alex. 	Team Green Arrow's ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea's bloodlust returns and she loses control in front of Alex. 	Team Green Arrow's ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea's bloodlust returns and she loses control in front of Alex. 	Team Green Arrow's ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea's bloodlust returns and she loses control in front of Alex. 	Team Green Arrow's ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea's bloodlust returns and she loses control in front of Alex. 	Team Green Arrow's ongoing battle with Damien Darhk is complicated by a shocking revelation. Thea's bloodlust returns and she loses control in front of Alex.
8 	 	Thor Freudenthal 	Greg Berlanti & Marc Guggenheim 	Brian Ford Sullivan & Marc Guggenheim 	December 2, 2015
Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage. 	Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage. 	Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage. 	Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage. 	Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage. 	Oliver and Barry Allen take Kendra Saunders and Carter Hall to a remote location to keep them hidden from Vandal Savage while they figure out how to defeat him. Malcolm arranges a meeting between Vandal, Green Arrow and The Flash that doesn't go as planned. Meanwhile, Felicity, Thea, Diggle and Laurel work with Team Flash to come up with a weapon powerful enough to destroy Vandal Savage.
9 	 	John Behring 	Wendy Mericle & Ben Sokolowski 	Wendy Mericle & Ben Sokolowski 	December 9, 2015
After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Oliver's mayoral holiday party. 	After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Oliver's mayoral holiday party. 	After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Oliver's mayoral holiday party. 	After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Oliver's mayoral holiday party. 	After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Oliver's mayoral holiday party. 	After the city is attacked again, Oliver makes a bold move against HIVE. Malcolm checks in on Thea and leaves her with a warning. Things take a horrible turn when Damien Darhk retaliates in a brutal manner at Oliver's mayoral holiday party.
10 	 	Jesse Warn 	Oscar Balderrama 	Oscar Balderrama 	January 20, 2016
Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Darhk. 	Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Darhk. 	Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Darhk. 	Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Darhk. 	Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Darhk. 	Oliver must deal with the devastating consequences of Darhk's last attack. Seeking revenge, Oliver goes on a brutal manhunt looking for Darhk.
11 	 	Charlotte Brandstrom 	Brian Ford Sullivan & Emilio Aldrich 	Brian Ford Sullivan & Emilio Aldrich 	January 27, 2016
Diggle must learn to trust his brother Andy when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life. 	Diggle must learn to trust his brother Andy when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life. 	Diggle must learn to trust his brother Andy when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life. 	Diggle must learn to trust his brother Andy when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life. 	Diggle must learn to trust his brother Andy when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life. 	Diggle must learn to trust his brother Andy when an enemy of their wartime past, an agent of the criminal organization Shadowspire, pays a visit to Star City. However, Diggle learns more than he bargained for about their shared time at war. Meanwhile, Oliver has to learn a whole new way of life.
12 	 	Kevin Fair 	Speed Weed & Beth Schwartz 	Speed Weed & Beth Schwartz 	February 3, 2016
The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City. 	The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City. 	The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City. 	The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City. 	The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City. 	The team faces off against a formidable villain nicknamed The Calculator. Meanwhile, Nyssa makes her move and Roy Harper returns to Star City.
13 	 	Gordon Verheul 	Ben Sokolowski 	Ben Sokolowski 	February 10, 2016
Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa. 	Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa. 	Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa. 	Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa. 	Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa. 	Oliver receives an offer from Nyssa that is hard to refuse. Meanwhile, Thea continues to battle the blood lust, Malcolm steps in to help his daughter, and Laurel has a heart to heart talk with Nyssa.
14 	 	James Bamford 	Wendy Mericle & Oscar Balderrama 	Wendy Mericle & Oscar Balderrama 	February 17, 2016
Oliver and team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son. 	Oliver and team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son. 	Oliver and team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son. 	Oliver and team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son. 	Oliver and team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son. 	Oliver and team uncover HIVE's plan to take out Team Arrow once and for all. With HIVE's next attack imminent, Lance wonders if Donna is safer without him in her life. Meanwhile, with the wedding fast approaching, Oliver begins to feel guilty that he hasn't told Felicity about his son.
15 	 	Gregory Smith 	Marc Guggenheim 	Keto Shimizu & Brian Ford Sullivan 	February 24, 2016
Oliver realizes he needs help battling Darhk so he calls in an old friend – Vixen. Using her magical ability to summon animal powers, Vixen gets a lock on Darhk's location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm. 	Oliver realizes he needs help battling Darhk so he calls in an old friend – Vixen. Using her magical ability to summon animal powers, Vixen gets a lock on Darhk's location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm. 	Oliver realizes he needs help battling Darhk so he calls in an old friend – Vixen. Using her magical ability to summon animal powers, Vixen gets a lock on Darhk's location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm. 	Oliver realizes he needs help battling Darhk so he calls in an old friend – Vixen. Using her magical ability to summon animal powers, Vixen gets a lock on Darhk's location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm. 	Oliver realizes he needs help battling Darhk so he calls in an old friend – Vixen. Using her magical ability to summon animal powers, Vixen gets a lock on Darhk's location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm. 	Oliver realizes he needs help battling Darhk so he calls in an old friend – Vixen. Using her magical ability to summon animal powers, Vixen gets a lock on Darhk's location and the team goes to war. Meanwhile, Thea has a heart-to-heart talk with Malcolm.
16 	 	John Showalter 	Rebecca Bellotto & Nolan Dunbar 	Rebecca Bellotto & Nolan Dunbar 	March 23, 2016
A heartbroken Cupid returns to Star City with one goal – to destroy anyone in love. The team learns she's killing couples on their wedding day so Oliver and Felicity decide to pose as bait. 	A heartbroken Cupid returns to Star City with one goal – to destroy anyone in love. The team learns she's killing couples on their wedding day so Oliver and Felicity decide to pose as bait. 	A heartbroken Cupid returns to Star City with one goal – to destroy anyone in love. The team learns she's killing couples on their wedding day so Oliver and Felicity decide to pose as bait. 	A heartbroken Cupid returns to Star City with one goal – to destroy anyone in love. The team learns she's killing couples on their wedding day so Oliver and Felicity decide to pose as bait. 	A heartbroken Cupid returns to Star City with one goal – to destroy anyone in love. The team learns she's killing couples on their wedding day so Oliver and Felicity decide to pose as bait. 	A heartbroken Cupid returns to Star City with one goal – to destroy anyone in love. The team learns she's killing couples on their wedding day so Oliver and Felicity decide to pose as bait.
17 	 	Michael Schultz 	Ben Sokolowski & Brian Ford Sullivan 	Ben Sokolowski & Brian Ford Sullivan 	March 30, 2016
Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity's spine. When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day. 	Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity's spine. When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day. 	Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity's spine. When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day. 	Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity's spine. When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day. 	Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity's spine. When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day. 	Brie Larvan breaks out of jail and turns up at Palmer Tech threatening to kill everyone unless she gets the bio-chip that is implanted in Felicity's spine. When Oliver realizes that Felicity, Thea and Donna are trapped in Palmer Tech with everyone else, he looks to a surprising ally to help Team Arrow save the day.
18 	 	Rob Hardy 	Marc Guggenheim & Keto Shimizu 	Marc Guggenheim & Keto Shimizu 	April 6, 2016
Oliver and Diggle learn that Merlyn is going to try to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis. 	Oliver and Diggle learn that Merlyn is going to try to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis. 	Oliver and Diggle learn that Merlyn is going to try to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis. 	Oliver and Diggle learn that Merlyn is going to try to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis. 	Oliver and Diggle learn that Merlyn is going to try to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis. 	Oliver and Diggle learn that Merlyn is going to try to break Darhk out of prison. Meanwhile, Laurel gets a surprising offer and Felicity has a heart-to-heart talk with Curtis.
19 	 	Laura Belsey 	Wendy Mericle & Beth Schwartz 	Wendy Mericle & Beth Schwartz 	April 27, 2016
Oliver and the team struggle to come to terms with Laurel's death, especially Diggle who is overwhelmed with guilt for choosing to believe Andy had changed. Meanwhile, Lance refuses to believe his daughter is really gone and asks Nyssa to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn't actually dead. 	Oliver and the team struggle to come to terms with Laurel's death, especially Diggle who is overwhelmed with guilt for choosing to believe Andy had changed. Meanwhile, Lance refuses to believe his daughter is really gone and asks Nyssa to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn't actually dead. 	Oliver and the team struggle to come to terms with Laurel's death, especially Diggle who is overwhelmed with guilt for choosing to believe Andy had changed. Meanwhile, Lance refuses to believe his daughter is really gone and asks Nyssa to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn't actually dead. 	Oliver and the team struggle to come to terms with Laurel's death, especially Diggle who is overwhelmed with guilt for choosing to believe Andy had changed. Meanwhile, Lance refuses to believe his daughter is really gone and asks Nyssa to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn't actually dead. 	Oliver and the team struggle to come to terms with Laurel's death, especially Diggle who is overwhelmed with guilt for choosing to believe Andy had changed. Meanwhile, Lance refuses to believe his daughter is really gone and asks Nyssa to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn't actually dead. 	Oliver and the team struggle to come to terms with Laurel's death, especially Diggle who is overwhelmed with guilt for choosing to believe Andy had changed. Meanwhile, Lance refuses to believe his daughter is really gone and asks Nyssa to help bring her back. A recent Black Canary sighting in Star City only seems to prove his theory that Laurel isn't actually dead.
20 	 	Gregory Smith 	Oscar Balderrama & Emilio Ortega Aldrich 	Oscar Balderrama & Emilio Ortega Aldrich 	May 4, 2016
As Oliver and Felicity look for a magical solution to defeat Darhk, a vengeance-driven Diggle gets a lead on Andy's whereabouts and heads off to confront his brother. Meanwhile, Alex takes Thea on a vacation that quickly turns into a nightmare. 	As Oliver and Felicity look for a magical solution to defeat Darhk, a vengeance-driven Diggle gets a lead on Andy's whereabouts and heads off to confront his brother. Meanwhile, Alex takes Thea on a vacation that quickly turns into a nightmare. 	As Oliver and Felicity look for a magical solution to defeat Darhk, a vengeance-driven Diggle gets a lead on Andy's whereabouts and heads off to confront his brother. Meanwhile, Alex takes Thea on a vacation that quickly turns into a nightmare. 	As Oliver and Felicity look for a magical solution to defeat Darhk, a vengeance-driven Diggle gets a lead on Andy's whereabouts and heads off to confront his brother. Meanwhile, Alex takes Thea on a vacation that quickly turns into a nightmare. 	As Oliver and Felicity look for a magical solution to defeat Darhk, a vengeance-driven Diggle gets a lead on Andy's whereabouts and heads off to confront his brother. Meanwhile, Alex takes Thea on a vacation that quickly turns into a nightmare. 	As Oliver and Felicity look for a magical solution to defeat Darhk, a vengeance-driven Diggle gets a lead on Andy's whereabouts and heads off to confront his brother. Meanwhile, Alex takes Thea on a vacation that quickly turns into a nightmare.
21 	 	Kevin Tancharoen 	Speed Weed & Jenny Lynn 	Speed Weed & Jenny Lynn 	May 11, 2016
When Team Arrow learns what Damien Darhk's next move is Felicity realizes she needs to ask her father, Noah Kuttler, for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled. 	When Team Arrow learns what Damien Darhk's next move is Felicity realizes she needs to ask her father, Noah Kuttler, for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled. 	When Team Arrow learns what Damien Darhk's next move is Felicity realizes she needs to ask her father, Noah Kuttler, for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled. 	When Team Arrow learns what Damien Darhk's next move is Felicity realizes she needs to ask her father, Noah Kuttler, for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled. 	When Team Arrow learns what Damien Darhk's next move is Felicity realizes she needs to ask her father, Noah Kuttler, for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled. 	When Team Arrow learns what Damien Darhk's next move is Felicity realizes she needs to ask her father, Noah Kuttler, for help. Noah and Oliver have a heart to heart talk that leaves Oliver rattled.
22 	 	Glen Winter 	Brian Ford Sullivan & Oscar Balderrama 	Brian Ford Sullivan & Oscar Balderrama 	May 18, 2016
Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk. 	Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk. 	Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk. 	Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk. 	Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk. 	Following the shocking events in the previous episode, Oliver and Diggle race to rescue Thea, while Felicity, Curtis and Noah join together to stop Darhk.
23 	 	John Behring 	Greg Berlanti 	Wendy Mericle & Marc Guggenheim 	May 25, 2016
Oliver teams up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all. 	Oliver teams up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all. 	Oliver teams up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all. 	Oliver teams up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all. 	Oliver teams up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all. 	Oliver teams up with a surprising force in an attempt to stop Damien Darhk and his magic once and for all.
==Trivia==
*This is the first season of :
**To not feature and .
***However, Deathstroke briefly appears as a hallucination.
**To not feature in any capacity.
*This is the second season of Arrow where the main antagonist is killed.
*This is the third season of Arrow to have a main character killed off.
==Gallery==
===Title cards===
Arrow season 4 title card.png|Title card
Legends of Yesterday title card.png|Variant title card in "Legends of Yesterday"
Broken Hearts title card.png|Variant title card in "Broken Hearts"
===Promotional images===
The Green Arrow first look.png|First look at Oliver's new costume.
Arrow season 4 SDCC poster.png|2015 San Diego Comic-Con poster
2015 SDCC poster - Defy your world. Dare to live in ours..png|2015 San Diego Comic-Con poster - "Defy your world. Dare to live in ours."
Arrow season 4 poster - Aim. Higher..png|"Aim. Higher."
John Diggle's costume first look.png|First look at John Diggle's costume.
John Diggle season 4 promo.png
John Diggle season 4 promo - mask and jacket.png
Arrow season 4 promo - Speedy.png
Arrow season 4 promo - Felicity Smoak.png
Arrow season 4 promo - Vixen.png|First look at Mari McCabe in live action.
Arrow season 4 poster - The sins of the father are revealed.png|"The sins of the fathers are revealed"
Arrow season 4 promo - Overwatch.png
Arrow season 4 poster - It's Darkest Before the Doom.png
===Concept artwork===
New Arrowcave concept artwork.png|Concept art for the new Arrowcave
Arrow season 4 - Coast City billboard.png
Arrow season 4 - Vixen concept artwork.png|Vixen concept artwork
===Videos===
Arrow Season 4 Trailer (HD)
Arrow Season 4 Promo "Embrace Your Dark Side" (HD)
Arrow Season 4 "Revenge" Promo (HD)
Arrow Season 4 Promo "Aim Higher" (HD)
Arrow Season 4 "The Saga Continues" Trailer (HD)
Arrow 2015 New York Comic-Con Sizzle Reel
Arrow So Cool Trailer The CW
Arrow Midseason Sizzle The CW
==References==
es:Temporada 4 (Arrow)
fr:Saison 4 (Arrow)
pl:Sezon 4 (Arrow)
pt-br:4ª Temporada (Arqueiro)
ru:Сезон 4 (Стрела)
de:Arrow Staffel 4