Supergirl (2015)

S02E20 City of Lost Children

In National City, an alien threat emerges, prompting Supergirl and the DEO to discover that the intruder is a Phorian, a typically gentle species endowed with telekinetic abilities. Guardian tracks down a lead on the Phorian's location, but instead of confronting the aggressor, he encounters a frightened young boy named Marcus. The boy is hesitant to trust anyone but James, leaving Guardian to take charge and protect the city from further attacks. Meanwhile, Rhea’s scheme intensifies.