The Flash (2014) (2014)

S3E17 Duet (II)

Title: Duet (II) Plot: Barry and his crew are taken aback when Mon-El and Hank Henshaw arrive from another Earth, bringing with them a comatose Supergirl, ensnared by the Music Meister’s spell. Unable to revive her, they seek out Team Flash for assistance. However, the Music Meister ambushes The Flash, plunging him into a similar state that Team Flash can't remedy. Barry and Kara awaken in a bizarre alternate reality where everything unfolds like a musical. To break free, they must adhere to the script, engaging in singing and dancing until they reach the finale. The crossover begins in Supergirl S02E16 Star-Crossed (I).