Title Airs On

S3:E1 Girl of Steel

Supergirl (CW)
10/09/2017 08:00 pm EDT

Kara deals with the loss on Mon-El by focusing her energy on being Supergirl and concentrating on a mysterious new threat; Alex ...read more Kara deals with the loss on Mon-El by focusing her energy on being Supergirl and concentrating on a mysterious new threat; Alex confesses a secret to Maggie; a citizen of National City has a mysterious connection to Kara; Lena makes a bold move. show less

S3:E2 Triggers

Supergirl (CW)
10/16/2017 08:00 pm EDT

A thief with psychic powers attacks National City and proves to be a formidable opponent for Supergirl.

S3:E3 Far From the Tree

Supergirl (CW)
10/23/2017 08:00 pm EDT

Eliza throws Alex and Maggie a wedding shower, which causes Maggie to reach out to her estranged father. Supergirl joins ...read more Eliza throws Alex and Maggie a wedding shower, which causes Maggie to reach out to her estranged father. Supergirl joins J’onn on a personal mission. show less

S3:E4 The Faithful

Supergirl (CW)
10/30/2017 08:00 pm EDT

Kara investigates a secretive new group whose leader, Thomas Coville, has a mysterious connection to Supergirl. Meanwhile, ...read more Kara investigates a secretive new group whose leader, Thomas Coville, has a mysterious connection to Supergirl. Meanwhile, Samantha feels like she’s letting Ruby down, and J’onn confesses an old secret. show less

S3:E5 Damage

Supergirl (CW)
11/06/2017 08:00 pm EST

MORGAN EDGE SETS HIS SIGHTS ON LENA — When multiple children get sick from lead poisoning, Morgan Edge points the finger at ...read more MORGAN EDGE SETS HIS SIGHTS ON LENA — When multiple children get sick from lead poisoning, Morgan Edge points the finger at Lena and blames her creation of the lead bomb she made to save National City from the Daxamites. While Lena knows she never intended any harm, she fears there may have been a flaw in her design, leaving her responsible. Kara teams up with Samantha to clear Lena’s name, but it turns out to be harder than they thought. Meanwhile, Alex and Maggie make a crucial decision about the future of their relationship. show less

S3:E6 Midvale

Supergirl (CW)
11/13/2017 08:00 pm EST

When Winn and the team discover an alien ship has crash landed deep underwater beneath National City, Kara/Supergirl is called ...read more When Winn and the team discover an alien ship has crash landed deep underwater beneath National City, Kara/Supergirl is called in to investigate. Meanwhile, Hank attempts to bond with his father, Myr’nn. Samantha, eager for some understanding of the changes she has been experiencing, looks to her estranged mother, Patricia Arias, for answers. show less

S3:E7 Wake Up

Supergirl (CW)
11/20/2017 08:00 pm EST

When Winn and the team discover an alien ship has crash landed deep underwater beneath National City, Kara/Supergirl is called ...read more When Winn and the team discover an alien ship has crash landed deep underwater beneath National City, Kara/Supergirl is called in to investigate. Meanwhile, Hank attempts to bond with his father, Myr’nn. Samantha, eager for some understanding of the changes she has been experiencing, looks to her estranged mother, Patricia Arias, for answers. show less

S3:E8 Crisis On Earth-X, Part 1

Supergirl (CW)
11/27/2017 08:00 pm EST

Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of ...read more Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth’s mightiest heroes – Green Arrow, Supergirl, The Flash and White Canary – lead their teams into battle to save the world. show less

S3:E9 Reign

Supergirl (CW)
12/04/2017 08:00 pm EST

Supergirl investigates a mysterious symbol popping up all over National City, tracing its origins back to an ancient prophecy ...read more Supergirl investigates a mysterious symbol popping up all over National City, tracing its origins back to an ancient prophecy and the mark of the World Killer, Reign. Meanwhile, the tension between Lena and Morgan Edge continues to build, causing James to step in and offer up some protection, and possibly igniting a spark in the process. show less

S3:E10 Legion of Super-Heroes

Supergirl (CW)
01/15/2018 08:00 pm EST

Struggling to heal from her injuries inflicted by Reign, Supergirl remains in a dreamlike state, unable to be reached. Mon-El ...read more Struggling to heal from her injuries inflicted by Reign, Supergirl remains in a dreamlike state, unable to be reached. Mon-El recruits one of the Legion members, Brainiac-5 (guest star Jesse Rath), to try to bring her back. Meanwhile, Reign continues her rampage on the city so the DEO teams up with the Legion of Superheroes to try to stop her. show less

S3:E11 Fort Rozz

Supergirl (CW)
01/22/2018 08:00 pm EST

As Reign (Odette Annable) continues to terrorize the city, Supergirl teams up with Saturn Girl, and the two recruit ...read more As Reign (Odette Annable) continues to terrorize the city, Supergirl teams up with Saturn Girl, and the two recruit Supergirl’s former enemies, Livewire and Psi, to form a team for a mission to Fort Rozz to recover a prisoner who has information on how to defeat Reign once and for all. show less

S3:E12 For Good

Supergirl (CW)
01/29/2018 08:00 pm EST

Someone tries to kill Morgan Edge and he barely survives. He accuses Lena of being behind the attempt and vows to destroy her. ...read more Someone tries to kill Morgan Edge and he barely survives. He accuses Lena of being behind the attempt and vows to destroy her. When Lena fears her hatred for Morgan will take her to the Luthor dark side, Kara steps in to help her friend. Meanwhile, after Sam realizes she’s losing time, she confides in Alex who decides to run some medical tests to see if she can find out what’s going on with her new friend show less

S3:E13 Both Sides Now

Supergirl (CW)
02/05/2018 08:00 pm EST

The DEO captures a second Worldkiller, Purity. Supergirl and Alex use very different methods of interrogation with Purity in ...read more The DEO captures a second Worldkiller, Purity. Supergirl and Alex use very different methods of interrogation with Purity in the hopes of finding out how to defeat Reign. However, Purity escapes and attacks the city’s subway tunnels. Meanwhile, J’onn, Winn and Mon-El band together to fix the Legion ship. show less

S3:E14 Schott Through the Heart

Supergirl (CW)
04/16/2018 08:00 pm EDT

When Winn’s father dies, his estranged mother, Mary (guest star Laurie Metcalf), reappears trying to reconnect and to explain ...read more When Winn’s father dies, his estranged mother, Mary (guest star Laurie Metcalf), reappears trying to reconnect and to explain why she abandoned him all those years ago. Winn is too embittered from his rough childhood to forgive her but when a copycat Toyman attacks, the two must work together to stop him. Mon-El tells Kara something important about the Worldkillers, and Alex becomes suspicious of Myr’nn’s (guest star Carl Lumbly) recent behavior. show less

S3:E15 In Search of Lost Time

Supergirl (CW)
04/23/2018 08:00 pm EDT

When Myr’nn (guest star Carl Lumbly) inadvertently causes psychic disturbances at the DEO, Supergirl must work with J’onn to ...read more When Myr’nn (guest star Carl Lumbly) inadvertently causes psychic disturbances at the DEO, Supergirl must work with J’onn to contain the resulting chaos. Meanwhile, Mon-El begins training Kara in fighting techniques he’s learned in the future for battling Worldkillers. show less

S3:E16 Of Two Minds

Supergirl (CW)
04/30/2018 08:00 pm EDT

Supergirl and Imra (guest star Amy Jackson) have different ideas on how to stop the third Worldkiller, Pestilence. However, when ...read more Supergirl and Imra (guest star Amy Jackson) have different ideas on how to stop the third Worldkiller, Pestilence. However, when both Alex and Winn are seriously injured by Pestilence, Supergirl and Imra team up to stop the destruction. show less

S3:E17 Trinity

Supergirl (CW)
05/07/2018 08:00 pm EDT

Still reeling after learning about Lena’s secret, Supergirl asks Guardian for a favor that could alter his relationship with ...read more Still reeling after learning about Lena’s secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle. show less

S3:E18 Shelter From the Storm

Supergirl (CW)
05/14/2018 08:00 pm EDT

When Reign starts hunting Ruby, Supergirl and Alex work together to keep her safe. Supergirl and J’onn look to Sam’s mother ...read more When Reign starts hunting Ruby, Supergirl and Alex work together to keep her safe. Supergirl and J’onn look to Sam’s mother for advice on how to stop Reign and come away with some shocking news. show less

S3:E19 The Fanatical

Supergirl (CW)
05/21/2018 08:00 pm EDT

When Tanya, a disciple of Coville’s, escapes from what’s left of his cult, she gives Kara and James a journal that could ...read more When Tanya, a disciple of Coville’s, escapes from what’s left of his cult, she gives Kara and James a journal that could hold the key to saving Sam. Someone learns Guardian’s identity and threatens to expose James if he doesn’t do what they ask. James contemplates what it means to be a black vigilante without a mask in America. show less

S3:E20 Dark Side of the Moon

Supergirl (CW)
05/28/2018 08:00 pm EDT

Supergirl is stunned to discover that a part of Krypton survived. Meanwhile, Alex is attacked while out with Ruby, and Lena ...read more Supergirl is stunned to discover that a part of Krypton survived. Meanwhile, Alex is attacked while out with Ruby, and Lena considers how far she will go to keep Reign contained. show less

S3:E21 Not Kansas

Supergirl (CW)
06/04/2018 08:00 pm EDT

Kara makes a major life decision. J’onn finds out that special DEO-caliber guns have hit the streets of National City.

S3:E22 Make It Reign

Supergirl (CW)
06/11/2018 08:00 pm EDT

Supergirl learns the true depth of Serena’s nefarious plans for Earth. Supergirl, Mon-El and Alura must devise a plan to stop ...read more Supergirl learns the true depth of Serena’s nefarious plans for Earth. Supergirl, Mon-El and Alura must devise a plan to stop her before Serena gets to Earth. J’onn prepares to say goodbye to his father. show less

S3:E23 Battles Lost and Won

Supergirl (CW)
06/18/2018 08:00 pm EDT

Supergirl and team take on Serena in an epic battle for Earth.