As the air date approaches we’re getting more information about the musical crossover between The Flash and Supergirl.

In case you missed it, Barry and Kara will be battling the Music Meister, played here by Glee alum Darren Criss. The CW’s official synopsis tells of an alternate reality and a 1940s setting.

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.

The recently released track listing points to a mix of classic covers and fun originals.

Benoist will perform Moon River, while Jeremy Jordan’s Winn, Carlos Valdes’ Cisco and John Barrowman’s Malcolm will team up for a dance heavy Put a Little Love in Your Heart.

One of the episode’s two original songs, Runnin Home to You, comes courtesy of La La Land’s Benj Pasek and Justin Paul. For the other original song the network didn’t have to look far.

Crazy Ex-Girlfriend’s Rachel Bloom co-wrote the tap duet Super Friend. Gustin enjoyed the song’s very distinct sound.

“It’s a goofy song and it’s very consistent with that style of ‘Crazy Ex-Girlfriend,’” said Gustin.

No word yet on what Jesse L. Martin or Victor Garber will be performing.

The crossover event begins at the end of the Monday, March 20 episode of Supergirl titled Star-Crossed. It concludes the next night Tuesday, March 21 on The Flash with Duet.

The CW airs Supergirl Mondays at 8 pm and The Flash Tuesdays at 8 pm.

Source: Comic Book Resources