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Supergirl
Season 3
Episode Guide
This guide does not list airdates for repeat showings.
Episodes
- Girl of Steel - Summary
- Triggers - Summary
- Far From The Tree - Summary
- The Faithful - Summary
- Damage - Summary
- Midvale - Summary
- Wake Up - Summary
- Crisis on Earth-X (4-Part Crossover) - Summary
- Reign - Summary
- Legion of Super-Heroes - Summary
- Fort Rozz - Summary
- For Good - Summary
- Both Sides Now - Summary
- Schott Through The Heart - Summary
- In Search of Lost Time - Summary
- Of Two Minds - Summary
- Trinity - Summary
- Shelter From The Storm - Summary
- The Fanatical - Summary
- Dark Side of the Moon - Summary
- Not Kansas - Summary
- Make It Reign - Summary
- Battles Lost and Won - Summary
Summaries
"Girl of Steel"
Kara (Melissa Benoist) deals with the loss of Mon-El (Chris Wood) by focusing all her energy on being Supergirl and the mysterious new threat against National City. Alex (Chyler Leigh) confesses a secret to Maggie (guest star Floriana Lima) about their impending nuptials. A citizen of National City has a mysterious connection to Kara, and Lena (Katie McGrath) makes a bold move.Read our review of this episode in the "Supergirl: Episode Reviews".
"Triggers"
Psi (guest star Yael Grobglas), 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 (Mehcad Brooks) and Lena (Katie McGrath) are at an impasse, and Samantha starts her new job at L-Corp.Read our review of this episode in the "Supergirl: Episode Reviews".
"Far From The Tree"
Eliza (guest star Helen Slater) throws Alex (Chyler Leigh) and Maggie (guest star Floriana Lima) a wedding shower, which causes Maggie to reach out to her estranged father (guest star Carlos Bernard). Supergirl (Melissa Benoist) joins J'onn (David Harewood) on a personal mission.Read our review of this episode in the "Supergirl: Episode Reviews".
"The Faithful"
Kara (Melissa Benoist) investigates a secretive new group whose leader, Thomas Coville (guest star Chad Lowe), has a mysterious connection to Supergirl. Meanwhile, Samantha (Odette Annable) feels like she's letting Ruby (guest star Emma Tremblay) down, and J'onn (David Harewood) confesses an old secret.Read our review of this episode in the "Supergirl: Episode Reviews".
"Damage"
When multiple children get sick from lead poisoning, Morgan Edge (guest star Adrian Pasdar) points the finger at Lena (Katie McGrath) 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 (Melissa Benoist) teams up with Samantha (Odette Annable) to clear Lena's name, but it turns out to be harder than they thought. Meanwhile, Alex (Chyler Leigh) and Maggie (guest star Floriana Lima) make a crucial decision about the future of their relationship.Read our review of this episode in the "Supergirl: Episode Reviews".
"Midvale"
Kara (Melissa Benoist) and Alex (Chyler Leigh) 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 Danvers sisters closer together. Izabela Vidovic plays Young Kara and Olivia Nikkanen plays Young Alex in flashbacks.Read our review of this episode in the "Supergirl: Episode Reviews".
"Wake Up"
When Winn (Jeremy Jordan) and the team discover an alien ship has crash landed deep underwater beneath National City, Kara/Supergirl (Melissa Benoist) is called in to investigate. Meanwhile, Hank (David Harewood) attempts to bond with his father, Myr'nn (guest star Carl Lumbly). Samantha (Odette Annable), eager for some understanding of the changes she has been experiencing, looks to her estranged mother, Patricia Arias (guest star Betty Buckley), for answers.Read our review of this episode in the "Supergirl: Episode Reviews".
"Crisis on Earth-X" (4-Part Crossover)
Barry (guest star Grant Gustin) and Iris's (guest star Candice Patton) 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 (guest star Wentworth Miller), The Ray (guest star Russell Tovey), Felicity Smoak (guest star Emily Bett Rickards), Iris West and Alex Danvers (Chyler Leigh) to take on their most formidable villains yet. Earth's mightiest heroes Ð Green Arrow (guest star Stephen Amell), Supergirl (Melissa Benoist), The Flash (guest star Grant Gustin) and White Canary (guest star Caity Lotz) Ð lead their teams into battle to save the world.Read our review of this episode in the "Supergirl: Episode Reviews".
"Reign"
Supergirl (Melissa Benoist) 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 (Odetee Annable). Meanwhile, the tension between Lena (Katie McGrath) and Morgan Edge (guest star Adrian Pasdar) continues to build, causing James to step in and offer up some protection, and possibly igniting a spark in the process.Read our review of this episode in the "Supergirl: Episode Reviews".
"The Legion of Super-Heroes"
Struggling to heal from her injuries inflicted by Reign (Odette Annable), Supergirl (Melissa Benoist) remains in a dreamlike state, unable to be reached. Mon-El (Chris Wood) 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.Read our review of this episode in the "Supergirl: Episode Reviews".
"Fort Rozz"
As Reign (Odette Annable) continues to terrorize the city, Supergirl (Melissa Benoist) teams up with Saturn Girl (guest star Amy Jackson), and the two recruit SupergirlÕs former enemies, Livewire (guest star Brit Morgan) and Psi (guest star Yael Grobglas), 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 (Chyler Leigh) babysits Ruby (guest star Emma Tremblay).Read our review of this episode in the "Supergirl: Episode Reviews".
"For Good"
Someone tries to kill Morgan Edge (guest star Adrian Pasdar) and he barely survives. He accuses Lena (Katie McGrath) 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 (Melissa Benoist) steps in to help her friend. Meanwhile, after Sam (Odette Annable) realizes she's losing time, she confides in Alex (Chyler Leigh) who decides to run some medical tests to see if she can find out what's going on with her new friend.Read our review of this episode in the "Supergirl: Episode Reviews".
"Both Sides Now"
The DEO captures a second Worldkiller, Purity (guest star Krys Marshall). Supergirl (Melissa Benoist) and Alex (Chyler Leigh) use very different methods of interrogation with Purity in the hopes of finding out how to defeat Reign (Odette Annable). However, Purity escapes and attacks the city's subway tunnels. Meanwhile, J'onn (David Harewood), Winn (Jeremy Jordan) and Mon-El (Christopher Wood) band together to fix the Legion ship.Read our review of this episode in the "Supergirl: Episode Reviews".
"Schott Through the Heart"
When WinnÕs (Jeremy Jordan) 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 (Chris Wood) tells Kara (Melissa Benoist) something important about the Worldkillers, and Alex (Chyler Leigh) becomes suspicious of MyrÕnnÕs (guest star Carl Lumbly) recent behavior.Read our review of this episode in the "Supergirl: Episode Reviews".
"In Search of Lost Time"
When M'yrnn (guest star Carl Lumbly) inadvertently causes psychic disturbances at the DEO, Supergirl (Melissa Benoist) must work with J'onn (David Harewood) to contain the resulting chaos. Meanwhile, Mon-El (Chris Wood) begins training Kara in fighting techniques he's learned in the future for battling Worldkillers.Read our review of this episode in the "Supergirl: Episode Reviews".
"Of Two Minds"
Supergirl (Melissa Benoist) and Imra (guest star Amy Jackson) have different ideas on how to stop the third Worldkiller, Pestilence. However, when both Alex (Chyler Leigh) and Winn (Jeremy Jordan) are seriously injured by Pestilence, Supergirl and Imra team up to stop the destruction.Read our review of this episode in the "Supergirl: Episode Reviews".
"Trinity"
Still reeling after learning about Lena's (Katie McGrath) secret, Supergirl (Melissa Benoist) asks Guardian (Mehcad Brooks) 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.Read our review of this episode in the "Supergirl: Episode Reviews".
"Shelter From The Storm"
When Reign (Odette Annable) starts hunting Ruby (guest star Emma Tremblay), Supergirl (Melissa Benoist) and Alex (Chyler Leigh) work together to keep her safe. Supergirl and J'onn (David Harewood) look to Sam's mother (guest star Betty Buckley) for advice on how to stop Reign and come away with some shocking news.Read our review of this episode in the "Supergirl: Episode Reviews".
"The Fanatical"
When Tanya (guest star Nesta Cooper), a disciple of Coville's, escapes from what's left of his cult, she gives Kara (Melissa Benoist) and James (Mehcad Brooks) a journal that could hold the key to saving Sam (Odette Annable). 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.Read our review of this episode in the "Supergirl: Episode Reviews".
"Dark Side of the Moon"
Supergirl (Melissa Benoist) is stunned to discover that a part of Krypton survived. Meanwhile, Alex (Chyler Leigh) is attacked while out with Ruby (guest star Emma Tremblay), and Lena (Katie McGrath) considers how far she will go to keep Reign contained.Read our review of this episode in the "Supergirl: Episode Reviews".
"Not Kansas"
Kara (Melissa Benoist) makes a major life decision. Meanwhile, J'onn (David Harewood) finds out that special DEO-caliber guns have hit the streets of National City.Read our review of this episode in the "Supergirl: Episode Reviews".
"Make It Reign"
Supergirl (Melissa Benoist) learns the true depth of Serena's (guest star Anjali Jay) nefarious plans for Earth. Supergirl, Mon-El (Chris Wood) and Alura (guest star Erica Durance) must devise a plan to stop her before Serena gets to Earth. J'onn (David Harewood) prepares to say goodbye to his father (guest star Carl Lumby).Read our review of this episode in the "Supergirl: Episode Reviews".
"Battles Lost and Won"
Supergirl (Melissa Benoist) and team take on Serena in an epic battle for Earth.Read our review of this episode in the "Supergirl: Episode Reviews".