Supergirl is an action-adventure drama based on the DC Comics character Kara Zor-El, Superman's (Kal-El) cousin who, after 12 years of keeping her powers a secret on Earth, decides to finally embrace her superhuman abilities and be the hero she was always meant to be.
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The American Alien 04x01
Battles Lost and Won 03x23
The heroes must come up with a way to defeat Reign without killing her. Afterward, Winn and Alex get job offers, Mon-El and Hank make decisions about their personal lives, and James has a news story for the world.
Make It Reign 03x22
Supergirl and Mon-El try to get to Earth to stop the Daughters of Juru from resurrecting Reign and triggering Earth's destruction. Meanwhile, Hank participates in The Reach with his father, and Ruby demands the truth from Sam.
Not Kansas 03x21
Kara and Mon-El return to Argo City, but not all is as it seems. Meanwhile, in Supergirl's absence, Guardian and the DEO deal with a dangerous gunman wielding DEO weaponry.
Dark Side of the Moon 03x20
Supergirl and Mon-El find a remnant of Krypton drifting deep in space. Meanwhile, Alex faces a killer from her past, and Winn ends up babysitting Ruby.
The Fanatical 03x19
Followers of Coville plan to use his journal to create a new Worldkiller. Meanwhile, Supergirl tries to repair the rift between her and Lena, and James is forced to consider whether to out himself or not.
Shelter from the Storm 03x18
Lena provides Alex with a safehouse to protect Ruby from Reign, who is looking to severe the last ties of humanity that Sam has with her family. Meanwhile, Supergirl discovers that Lena has been manufacturing Kryptonite, and the Legionnaires depart for the future.
Supergirl discovers that she has a mental link to Sam and Julia, and takes Lena and Alex with her to rescue them. Meanwhile, James faces a tough decision when he must decide whether to investigate Lena or not after she kept Reign's existence a secret.
Of Two Minds 03x16
The third Worldkiller, Pestilence, begins striking down the citizens of National City.... including Winn and Alex. Supergirl and Imra disagree on how to deal with Pestilence, and Lena continues trying to find a cure for Sam.
In Search of Lost Time 03x15
M'yrnn tries to redirect his mental processes and ends up infecting the DEO with a telepathic rage virus. Meanwhile, Lena tries to convince Sam that the latter transforms into Reign during her blackouts.
Schott Through the Heart 03x14
After Winslow dies, his wife Mary comes to National City to attempt to reunite with Winn. However, a new murderous toymaker threatens Winn and Mary, Meanwhile, M'yrnn asks Alex to keep a secret from Hank, and Mon-El tries to find the right time to tell Supergirl something important about one of the Worldkillers.