Supergirl (2015)

S2E16 Star-Crossed (I)

Title: Star-Crossed (I) Plot: A mysterious new threat emerges in National City, causing Supergirl to be on edge. At the same time, Winn finds himself in legal trouble due to his girlfriend, Lyra's reckless choices. Maggie steps in to assist Winn, but past allegiances complicate matters. As tensions rise, Supergirl faces off against the Music Meister. The crossover continues in The Flash Season 3, Episode 17, titled Duet (II).