Supergirl
Season 2, Episode 9: Supergirl Lives
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Kara is moved by the story of a missing woman named Izzy and decides to investigate despite Snapper Carr's order to leave it alone. Kara takes Mon-El with her to the last place Izzy was seen and the duo find themselves thrust through a portal to another planet, Slaver's Moon, where the downtrodden are sold as slaves. The leader of the trafficking ring is none other than Roulette. To make matters worse, Slaver's Moon has a red sun, which means Kara and Mon-El are stripped of their powers and stuck on the planet with no way home. Meanwhile, back on Earth, Alex blames herself for Kara's disappearance, fearing she's become too focused on her new relationship with Maggie and too complacent in watching out for her sister.
All Episodes - Season 2
Episode 1
The Adventures of Supergirl
Episode 2
The Last Children of Krypton
Episode 3
Welcome to Earth
Episode 4
Survivors
Episode 5
Crossfire
Episode 6
Changing
Episode 7
The Darkest Places
Episode 8
Medusa (I)
Episode 9
Supergirl Lives
Episode 10
We Can Be Heroes
Episode 11
The Martian Chronicles
Episode 12
Luthors
Episode 13
Mr. & Mrs. Mxyzptlk
Episode 14
Homecoming
Episode 15
Exodus
Episode 16
Star-Crossed (I)
Episode 17
Distant Sun
Episode 18
Ace Reporter
Episode 19
Alex
Episode 20
City of Lost Children
Episode 21
Resist
Episode 22
Nevertheless, She Persisted