City of Lost Children

"City of Lost Children" is the upcoming twentieth episode of the second season of Supergirl, and the fortieth episode overall. It will air on May 8, 2017.

Synopsis
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.