Supergirl/Season Three

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Season Three
Season Premiere October 9, 2017
Season Finale June 18, 2018
Episode Count 23
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Season Two


Season Four

Season Three of Supergirl premiered on October 9, 2017.


# # Title Written By Directed By Airdate Viewers 18-49 Rating Prod.
43 1 Girl of Steel Andrew Kreisberg Jesse Warn October 9, 2017 1.867M 0.5% T13.20651
Kara deals with the loss of Mon-El by focusing all her energy on being Supergirl and the mysterious new threat against National City. Alex confesses a secret to Maggie about their impending nuptials. A citizen of National City has a mysterious connection to Kara, and Lena makes a bold move.
Teleplay by Robert Rovner and Caitlin Parrish
44 2 Triggers Gabriel Llanas &
Anna Musky-Goldwyn
David McWhirter October 16, 2017 1.755M 0.5% T13.20652
Psi, a thief with psychic powers, attacks National City. Able to immobilize people by tapping into their worst fears, Psi proves a formidable opponent for Supergirl. Meanwhile, James and Lena are at an impasse, and Samantha starts her new job at L-Corp.
45 3 Far from the Tree Jessica Queller &
Derek Simon
Dermott Downs October 23, 2017 1.762M 0.5% T13.20653
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.
46 4 The Faithful Paula Yoo &
Katie Rose Rogers
Jesse Warn October 30, 2017 1.823M 0.5% T13.20654
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.
47 5 Damage Eric Carrasco &
Cindy Lichtman
Kevin Smith November 6, 2017 1.87M 0.5% T13.20655
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.
48 6 Midvale Caitlin Parrish &
Jess Kardos
Rob Greenlea November 13, 2017 1.893M 0.5% T13.20656
Kara and Alex head home to Midvale for a little R&R. While there, Kara recalls a painful memory of a childhood friend's death and how that traumatic experience brought the Danver sisters closer together.
49 7 Wake Up Gabriel Llanas &
Anna Musky-Goldwyn
Chad Lowe November 20, 2017 1.922M 0.5% T13.20657
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.
50 8 Crisis on Earth-X (1)
part 1 of 4 part crossover with Arrow, The Flash & DC's Legends of Tomorrow
Andrew Kreisberg &
Marc Guggenheim
Larry Teng November 27, 2017 2.713M 0.9% T13.20658
Barry and Iris's wedding brings the gang together, but things go awry when villains from Earth-X, a parallel Earth where the Nazis won World War II and now dominate their world, 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.
Teleplay by Robert Rovner & Jessica Queller
51 9 Reign Paula Yoo &
Caitlin Parrish
Glen Winter December 4, 2017 1.81M 0.8% T13.20659
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.
52 10 Legion of Super-Heroes Derek Simon &
Eric Carrasco
Jesse Warn January 15, 2018 2.168M 0.6% T13.20660
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, 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.
53 11 Fort Rozz Gabriel Llanas &
Anna Musky-Goldwyn
Gregory Smith January 22, 2018 2.065M 0.5% T13.20661
As Reign 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. Meanwhile, Alex babysits Ruby.
54 12 For Good Robert Rovner Tawnia McKiernan January 29, 2018 2.114M 0.6% T13.20662
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.
Teleplay by Cindy Lichtman & Alix Sternberg
55 13 Both Sides Now Jessica Queller &
Paula Yoo
Jesse Warn February 5, 2018 2.119M 0.6% T13.20663
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.
56 14 Schott Through the Heart Caitlin Parrish &
Derek Simon
Glen Winter April 16, 2018 1.911M 0.5% T13.20664
When Winn's father dies, his estranged mother, Mary, 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 recent behavior.
57 15 In Search of Lost Time Eric Carrasco Andi Armaganian April 23, 2018 1.384M 0.4% T13.20665
When Myr'nn 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.
Teleplay by Katie Rose Rogers & Nicki Holcomb
58 16 Of Two Minds Gabriel Llanas &
Anna Musky-Goldwyn
Alexandra La Roche April 30, 2018 1.504M 0.5% T13.20666
Supergirl and Imra 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.
59 17 Trinity Jessica Queller Jesse Warn May 7, 2018 1.595M 0.5% T13.20667
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.
Teleplay by Caitlin Parrish & Derek Simon
60 18 Shelter from the Storm Robert Rovner Antonio Negret May 14, 2018 1.534M 0.5% T13.20668
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.
Teleplay by Lindsay Gelfand & Allison Weintraub
61 19 The Fanatical Paula Yoo &
Eric Carrasco
Mairzee Almas May 21, 2018 1.471M 0.4% T13.20669
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.
62 20 Dark Side of the Moon Derek Simon &
Katie Rose Rogers
Hanelle Culpepper May 28, 2018 1.569M 0.4% T13.20670
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.
63 21 Not Kansas Gabriel Llanas &
Anna Musky-Goldwyn
Dermott Downs June 4, 2018 1.83M 0.5% T13.20671
Kara makes a major life decision. Meanwhile, J'onn finds out that special DEO-caliber guns have hit the streets of National City.
64 22 Make It Reign Ray Utarnachitt &
Cindy Lichtman
Armen V. Kevorkian June 11, 2018 1.759M 0.4% T13.20672
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.
65 23 Battles Lost and Won Robert Rovner &
Jessica Queller
Jesse Warn June 18, 2018 1.776M 0.5% T13.20673
Supergirl and team take on Serena in an epic battle for Earth.

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