Streaming Info: Season 3
Girl of Steel
Kara deals with the loss of 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.
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A thief who has psychic powers attacks National City, immobilizing victims by tapping into their worst fears; James and Lena are at an impasse; Samantha starts her new job at L-Corp.
Far From the Tree
Eliza throws Alex and Maggie a wedding shower; Maggie reaches out to her estranged father; Supergirl joins J'onn on a personal mission.
The Faithful
Kara investigates a new group that has a mysterious connection to Supergirl; Samantha feels like she's letting Ruby down; J'onn confesses an old secret.
Damage
Morgan Edge blames Lena's lead bomb when multiple children get sick; Kara teams up with Samantha to clear Lena's name; Alex and Maggie make a decision about their relationship.
Midvale
Kara and Alex head home to Midvale for a little rest; Kara recalls a painful childhood memory that brought the Danver sisters closer together.
Wake Up
Kara investigates when an alien ship crash lands deep underwater beneath National City; Hank attempts to bond with his father; Samantha looks to her estranged mother for answers.
Crisis on Earth-X, Part 1
Barry and Iris' wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony.
Reign
Supergirl learns that a mysterious symbol popping up in the city is the mark of the World Killer, Reign; tension between Lena and Morgan Edge continues to build.
Legion of Superheroes
Struggling to heal from her injuries inflicted by Reign, Supergirl remains in a dreamlike state, unable to be reached; Mon-El recruits a Legion member to try bringing her back; the DEO teams up with the Legion of Superheroes to try to stop Reign.
Fort Rozz
Supergirl teams up with Saturn Girl, Livewire and Psi to recover a prisoner who has information on how to defeat Reign; Alex baby-sits Ruby.
For Good
Kara steps in to help Lena when she is threatened by Morgan; Alex decides to run medical tests to see if she can help Sam.
Both Sides Now
When the DEO captures a second Worldkiller, Supergirl and Alex use very different methods of interrogation in an effort to learn how to defeat Reign; J'onn, Winn and Mon-El band together to fix the Legion ship.
Schott Through the Heart
When Winn's father dies, his estranged mother tries to reconnect and explain why she abandoned him; a copycat Toyman attacks and the two must work together to stop him; Mon-El tells Kara something important about the Worldkillers.
In Search of Lost Time
Myr'nn inadvertently causes psychic disturbances at the DEO; Supergirl must work with J'onn to contain the chaos; Mon-El begins training Kara in fighting techniques he's learned in the future.
Of Two Minds
Supergirl and Imra have different ideas on how to stop the third Worldkiller, Pestilence; Pestilence seriously injures both Alex and Winn, Supergirl and Imra team up to stop the destruction.
Trinity
Still reeling after learning Lena's secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever; with all three Worldkillers united, Supergirl and the team brace for an epic battle.
Shelter From the Storm
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.
The Fanatical
When 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 threatens to expose James if he doesn't do what is asked of him.
Dark Side of the Moon
Supergirl is stunned to learn that a part of Krypton survived; Alex is attacked while out with Ruby; Lena considers how far she will go to keep Reign contained.
Not Kansas
Kara makes a major life decision; J'onn discovers that special DEO-caliber guns have hit the streets of National City.
Make It Reign
After learning the true depth of Serena's nefarious plans for Earth, Supergirl, Mon-El and Alura must come up with a plan to stop her; J'onn prepares to say goodbye to his father.
Battles Lost and Won
Supergirl and the team face off against Serena in an epic battle for Earth.
