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What "Supergirl" 20-th episode about
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.
Episode number: 20
Episode name: "City of Lost Children"
Episode release date: 9 may 2017 at 00:00
Status: aired
Rating: 7.3