When a girl disappears, Kara discovers a pattern of missing people and goes looking with Mon-El... and they both end up on an alien planet under a red sun which renders them powerless. Meanwhile, Winn has a brush with death, and Alex and Maggie have their first disagreement.

M'gann's White Martian mate Armek comes to Earth to bring her back to face justice for her "treachery' When she takes refuge in the DEO, Armek infiltrates the building and uses his shapeshifting powers to spread confusion.