Season 03, Episode 14 – “Schott Through the Heart”
When Winn’s father dies, his estranged mother 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.
Season 03, Episode 13 – “Both Sides Now”
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.
Season 03, Episode 12 – “For Good”
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.
Season 03, Episode 11 – “Fort Rozz”
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.
Season 03, Episode 10 – “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 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.
Season 03, Episode 09 – “Reign”
A mysterious symbol popping up all over National City is investigated. Its origins are traced 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.
Season 03, Episode 08 – “Crisis on Earth-X, Part 1”
Part 1 of 4. 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 join forces 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.
Season 03, Episode 07 – “Wake Up”
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; and Samantha, eager for some understanding of the changes she has been experiencing, looks to her estranged mother, Patricia Arias, for answers.
Season 03, Episode 06 – “Midvale”
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.
Season 03, Episode 05 – “Damage”
Multiple children get sick from lead poisoning and Morgan Edge blames Lena for creating the lead bomb she made to save National City from the Daxamites. Meanwhile, Alex and Maggie make a crucial decision about the future of their relationship.