Supergirl/Season Four

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Season Four
Season Premiere October 14, 2018
Season Finale May 19, 2019
Episode Count 22
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Season Three


Season Five

Season Four of Supergirl premiered on October 14, 2018.


# # 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

Supergirl Seasons
Season 1 | Season 2 | Season 3 | Season 4 | Season 5