Supergirl/Season Four

Season Four
Supergirl
Season Premiere	October 14, 2018
Season Finale	May 19, 2019
Episode Count	22
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Season Four of Supergirl premiered on October 14, 2018.

Episodes

#	#	Title	Written By	Directed By	Airdate	Viewers	18-49 Rating	Prod.
66	1	American Alien	Robert Rovner & Jessica Queller	Jesse Warn	October 14, 2018	1.523M	0.5%	T13.21201
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 DEO. 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. Teleplay by Gabriel Llanas & Aadrita Mukerji
67	2	Fallout	Dana Horgan	Harry Jierjian	October 21, 2018	1.341M	0.4%	T13.21202
A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the DEO. 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. Teleplay by Maria Maggenti & Daniel Beaty
68	3	Man of Steel	Rob Wright & Derek Simon	Jesse Warn	October 28, 2018	1.281M	0.4%	T13.21203
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.
69	4	Ahimsa	Eric Carrasco	Armen V. Kevorkian	November 4, 2018	1.229M	0.4%	T13.21204
When Supergirl needs help, Alex asks Lena and Brainiac to team up. Meanwhile, J'onn questions his decision to quit the DEO. However, after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens during this tumultuous time. Teleplay by Katie Rose Rogers & Jess Kardos
70	5	Parasite Lost	Maria Maggenti & Aadrita Mukerji	David McWhirter	November 11, 2018	1.157M	0.3%	T13.21205
Colonel Haley makes a surprising decision regarding Supergirl. Kara writes s 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.
71	6	Call to Action	Gabriel Llanas & Daniel Beaty	Antonio Negret	November 18, 2018	1.134M	0.3%	T13.21206
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.
72	7	Rather the Fallen Angel	Dana Horgan & Katie Rose Rogers	Chad Lowe	November 25, 2018	1.154M	0.3%	T13.21207
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.
73	8	Bunker Hill	Rob Wright & Eric Carrasco	Kevin Smith	December 2, 2018	1.257M	0.4%	T13.21208
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.
74	9	Elseworlds (3) part 3 of 3 part crossover with The Flash & Arrow	Marc Guggenheim	Jesse Warn	December 11, 2018	2.167M	0.8%	T13.21209
Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives. Teleplay by Derek Simon & Robert Rovner
75	10	Suspicious Minds	Maria Maggenti & Gabriel Llanas	Rachel Talalay	January 20, 2019	1.038M	0.3%	T13.21210
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.
76	11	Blood Memory	Jessica Queller & Dana Horgan	Shannon Kohli	January 27, 2019	1.337M	0.3%	T13.21211
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 encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers.
77	12	Menagerie	Robert Rovner	Stefan Pleszczynski	February 17, 2019	1.146M	0.3%	T13.21212
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 DEO, 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. Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party. Teleplay by Daniel Beaty & Greg Baldwin
78	13	What's So Funny About Truth, Justice, and the American Way?	Eric Carrasco & Aadrita Mukerji	Alexis Ostrander	March 3, 2019	1.139M	0.4%	T13.21213
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.
79	14	Stand and Deliver	Rob Wright & Jess Kardos	Andi Armaganian	March 10, 2019	1.048M	0.3%	T13.21214
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.
80	15	O Brother, Where Art Thou?	Derek Simon & Nicki Holcomb	Tawnia Mckiernan	March 17, 2019	1.067M	0.3%	T13.21215
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.
81	16	The House of L	Dana Horgan & Eric Carrasco	Carl Seaton	March 24, 2019	1.122M	0.3%	T13.21216
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.
82	17	All About Eve	Gabriel Llanas	Ben Bray	March 31, 2019	1.056M	0.3%	T13.21217
Supergirl must deal with the destructive aftermath of Lex's nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet. Teleplay by Katie Rose Rogers & Brooke Pohl
83	18	Crime and Punishment	Rob Wright	Antonio Negret	April 21, 2019	994k	0.3%	T13.21218
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 DEO and acquires some powerful weapons to hunt Supergirl. Teleplay by Lindsay Sturman & Aadrita Mukerji
84	19	American Dreamer	Dana Horgan	David Harewood	April 28, 2019	1.138M	0.3%	T13.21219
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. Teleplay by Daniel Beaty & Jess Kardos
85	20	Will the Real Miss Tessmacher Please Stand Up?	Derek Simon	Shannon Kohli	May 5, 2019	1.05M	0.3%	T13.21220
Kara and Lena head to Kaznia to hunt down Lex. However, Eve Tessmacher 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 DEO. Teleplay by Katie Rose Rogers & Natalie Abrams
86	21	Red Dawn	Lindsay Sturman	Alexis Ostrander	May 12, 2019	1.11M	0.3%	T13.21221
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, and Brainy, Nia and J'onn set out to track down aliens who have been abducted by Lex. Teleplay by Gabriel Llanas & Eric Carrasco
87	22	The Quest for Peace	Robert Rovner & Jessica Queller	Jesse Warn	May 19, 2019	1.074M	0.3%	T13.21222
Lex Luthor descends upon Washington, DC 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. Teleplay by Rob Wright & Derek Simon