Watch Supergirl [S2E20] : City of Lost Children Full Episode Online for Free in HD @ br br Air Date : October 10th, 2016 br Season Number : 2 br Episode Number : 20 br Episode Name : City of Lost Children br Networks : CBS, The CW br Genres : Action, Adventure, Drama, Science Fiction br br Storyline: br 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.