Star-Crossed (I)
A new villain comes to National City, putting Supergirl on high alert. Meanwhile, Winn’s girlfriend, Lyra, gets Winn in trouble with the law. Maggie attempts to help Winn but old loyalties get in the way. The Music Meister attacks Supergirl. The crossover continues on The Flash S03E17 Duet (II).

Cast
Melissa BenoistKara Danvers / Supergirl / Kara Zor-El
Chyler LeighAlex Danvers / Sentinel
David HarewoodJ'onn J'onzz / Martian Manhunter
Katie McGrathLena Luthor
Jesse RathQuerl 'Brainy' Dox / Brainiac-5
Nicole MainesNia Nal / Dreamer
Azie TesfaiKelly Olsen / Guardian
Julie GonzaloAndrea Rojas / Acrata
Staz NairWilliam Dey
Peta SergeantNyxlygsptlnz / 'Nyxly'Supergirl on tvt

