Fun Full Promo for THE FLASH/SUPERGIRL Musical Crossover Episode "Duet"

If you are excited about the upcoming musical Flash/Supergirl crossover, “Duets,” get more excited, because we have a full trailer for it, and it looks bonkers and fun. Of course, it’s a TV episode, so by “full trailer” I mean 20 second promo spot, but still. The crosscutting to show every actor in the CW/DC universe with singing chops — Jesse L. Martin, Victor Garber, Jeremy Jordan, and John Barrowman all have Broadway/West End backgrounds — makes me think Berlanti and company just thought, “All these people can sing, let’s have some fun and put on a show.” Of course, the titular leads, Melissa Benoist and Grant Gustin, were both on Glee, so we’ve heard them sing before. Here is the official synopsis:

Barry (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 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.

It seems pretty silly, but lots of fun. Hopefully they can follow the yellow brick road — wait, what’s wrong with me, I mean the script — well enough to survive, because it would go down as one of the weirdest moments in TV history if the Music Meister takes out a superhero in a musical coma.

"Duets" airs on Tuesday, March 21 on The CW.