Soooo, there is going to be a musical crossover? Yeah. Original songs come from Crazy Ex-Girlfriend star Rachel Bloom and La La Land songwriters Benj Pasek and Justin Paul. the crossover even, set in the 1940s, starts with March 20th Supergirl episode Star-Crossed and continues March 21 with The Flash episode Duet. The synopsis is as follows:
The episode will feature a mix of original songs written by “” and Academy Award-winning “” . The musical will also feature a variety of cover songs and will be .
DARREN CRISS (“GLEE”) GUEST STARS AS THE MUSIC MEISTER IN THE FLASH AND SUPERGIRL MUSICAL CROSSOVER – Barry (Grant Gustin) and team are surprised when Mon-El (guest star Chris Wood) and Hank Henshaw (guest star David Harewood) arrive on their Earth carrying a comatose Supergirl (guest star Melissa Benoist) who was whammied by the Music Meister (guest star Darren Criss). Unable to wake her up, they turn to Team Flash to save her. However, the Music Meister surprises The Flash and puts him in a similar coma, one that Team Flash can’t cure. Kara and Barry wake up without their powers in an alternate reality where life is like a musical and the only way to escape is by following the script, complete with singing and dancing, to the end. Dermott Downs directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Aaron Helbing & Todd Helbing. Original airdate 3/21/2017.