VIDEO: First Look - Darren Criss as 'Music Meister' in Tonight's SUPERGIRL

ET has shared an exclusive first look at Darren Criss guest starring as Music Meister in tonight's episode of SUPERGIRL on The CW. Tonight's appearance leads up to the highly anticipated THE FLASH/SUPERGIRL musical crossover episode. Check it out below!

The SUPERGIRL and THE FLASH musical crossover episode will feature Broadway's Jeremy Jordan, Jesse L. Martin and Darren Criss in a guest starring role as The Music Meister. In addition, the episode will feature the original song "Runnin' Home to You," penned by the Oscar-winning songwriting team of Benj Pasek and Justin Paul (LA LA LAND, DEAR EVAN HANSEN) and the original song "Super Friends" penned by CRAZY EX-GIRLFRIEND creator and star Rachel Bloom and performed by Gustin and Melissa Benoist.

The Flash/Supergirl musical episode titled "Duet," airs on Tuesday, March 21st and is described as follows: "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."

Source: ET