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).
However, the Music Meister surprises The Flash and puts him in a similar coma, one that Team Flash can’t cure.
The two-night event will get started with Supergirl on March 20, and crescendo in the following night’s Flash “Duet.”
Unable to wake her up, they turn to Team Flash to save her.