Title Airs On
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S4:E1 The American Alien

Supergirl (CW)
10/14/2018 08:00 pm EDT

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S4:E2 Fallout

Supergirl (CW)
10/21/2018 08:00 pm EDT

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S4:E3 Man of Steel

Supergirl (CW)
10/28/2018 08:00 pm EDT

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S4:E4 Ahimsa

Supergirl (CW)
11/04/2018 08:00 pm EST

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S4:E5 Parasite Lost

Supergirl (CW)
11/11/2018 08:00 pm EST

Colonel Haley makes a surprising decision regarding Supergirl. Kara writes s series of articles highlighting aliens in National ...read more 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. show less

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S4:E6 Call to Action

Supergirl (CW)
11/18/2018 08:00 pm EST

Everyone gathers for Thanksgiving but Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien ...read more 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. show less

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S4:E7 Rather the Fallen Angel

Supergirl (CW)
11/25/2018 08:00 pm EST

James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester ...read more 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. show less

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S4:E8 Bunker Hill

Supergirl (CW)
12/02/2018 08:00 pm EST

Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream, Kara and Brainy try to persuade Nia ...read more Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream, Kara and Brainy try to persuade Nia to embrace her destiny, and Manchester Black pays Ben Lockwood a menacing visit. show less

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S4:E9 Elseworlds Hour 3

Supergirl (CW)
12/11/2018 08:00 pm EST

Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives.

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S4:E10 Suspicious Minds

Supergirl (CW)
01/20/2019 08:00 pm EST

Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. ...read more 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.. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives. show less

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S4:E11 Blood Memory

Supergirl (CW)
01/27/2019 08:00 pm EST

Kara travels with Nia to the latter's hometown and discovers that Nia is inheriting the Dreamer power from her mother... ...read more Kara travels with Nia to the latter's hometown and discovers that Nia is inheriting the Dreamer power from her mother... which has skipped Nia's sister Maeve. In National City, an outbreak of a new drug rage starts and Alex investigates while asking J'onn to determine if she's having memory problems. show less

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S4:E12 Menagerie

Supergirl (CW)
02/17/2019 08:00 pm EST

With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened ...read more 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. show less

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S4:E13 What's So Funny About Truth, Justice, and the American Way?

Supergirl (CW)
03/03/2019 08:00 pm EST

Manchester Black breaks out of prison with the help of his new team, The Elite, who are set on punishing the anti-alien forces. ...read more 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. show less

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S4:E14 Stand and Deliver

Supergirl (CW)
03/10/2019 08:00 pm EDT

Between Ben Lockwood's new push to stir up the anti-alien movement and the Elite's desire to target Lockwood and his ...read more 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. show less

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S4:E15 O Brother, Where Art Thou?

Supergirl (CW)
03/17/2019 08:00 pm EDT

Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. ...read more 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. show less

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S4:E16 The House of L

Supergirl (CW)
03/24/2019 08:00 pm EDT

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 ...read more 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. show less

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S4:E17 All About Eve

Supergirl (CW)
03/31/2019 08:00 pm EDT

J'onn has a meeting with his deceased father, while Supergirl, Alex, and Lena join forces to track down Eve and locate ...read more J'onn has a meeting with his deceased father, while Supergirl, Alex, and Lena join forces to track down Eve and locate Lex. show less

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S4:E18 Crime and Punishment

Supergirl (CW)
04/21/2019 08:00 pm EDT

Supergirl and Lena go to Stryker's Island to check out Lex's cell, and find a clue to his schemes. Supergirl is declared ...read more Supergirl and Lena go to Stryker's Island to check out Lex's cell, and find a clue to his schemes. Supergirl is declared a criminal and is forced to question whether she does more harm or good, while James deals with the fallout from being injected with the serum. show less

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S4:E19 American Dreamer

Supergirl (CW)
04/28/2019 08:00 pm EDT

As Kara doggedly works as a reporter to clear Supergirl's name, Dreamer picks up the slack as National City's protector, ...read more 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. show less

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S4:E20 Will the Real Miss Tessmacher Please Stand Up?

Supergirl (CW)
05/05/2019 08:00 pm EDT

Kara and Lena head to Kaznia to hunt down Lex. However, Eve Tessmacher sets a trap for the duo that could ultimately reveal that ...read more 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. show less

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S4:E21 Red Dawn

Supergirl (CW)
05/12/2019 08:00 pm EDT

Kara comes face to face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the ...read more 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. show less

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S4:E22 The Quest for Peace

Supergirl (CW)
05/19/2019 08:00 pm EDT

Lex Luthor descends upon Washington, DC and summons Lena and Lillian Luthor to the White House. Supergirl realizes she has one ...read more 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. show less