Take a look @ footage, images and brief synopsis from the "Supergirl" episode "City of Lost Children", written by Robert Rovner, Gabriel Llanas, Anna Musky-Goldwyn and directed by Ben Bray, airing May 8, 2017 on The CW:
"...when an alien attacks 'National City', 'Supergirl' (Melissa Benoist) and the 'DEO' learn the alien is a 'Phorian', an otherwise peaceful race with telekinetic powers.
"'Guardian' (Mehcad Brooks) gets a lead on the Phorian's address but instead of finding the culprit, he finds a very scared boy named 'Marcus' (Lonnie Chavis). Marcus will only trust James so it is up to Guardian to stop the attacks on the city.Then a plan from 'Rhea' (Teri Hatcher) escalates..."
Click the images to enlarge and Sneak Peek "Supergirl: City Of Lost Children"...