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.
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