Supergirl
Season 2, Episode 20: City of Lost Children
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When an alien attacks National City, Supergirl and the DEO learn the alien is a Phorian, an otherwise peaceful race with telekinetic powers. Guardian gets a lead on the Phorian's address but instead of finding the culprit, he finds a very scared boy named Marcus. Marcus will only trust James so it is up to Guardian to stop the attacks on the city. Rhea's plan escalates.
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