"Welcome to New Daxam."

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


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.[1]




  • James makes a reference to being a vigilante like 'Clark's friend' to whom Winn makes points at the side of his head like spiky ears. These are indirect references to Batman.
  • At one point Winn whistles the tune of 'Super Friend' from the 17th episode of The Flash, Duet. It was a crossover episode between the two shows in which Kara and Barry were transported into a musical. Other people showed up as characters in the musical. Winn was the pianist who played the piano for that song.