Season 02, Episode 20 – City of Lost Children
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. Meanwhile, Rhea’s plan escalates.
Twenty-four-year-old Kara Zor-El, who was taken in by the Danvers family when she was 13 after being sent away from Krypton, must learn to embrace her powers after previously hiding them. The Danvers teach her to be careful with her powers, until she has to reveal them during an unexpected disaster, setting her on her journey of heroism.