Darren Criss will star as the Music Meister in The CW's upcoming The Flash / Supergirl musical crossover.

<em>Grant Gustin (left) and Darren Criss (right) in Glee</em>

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According to TVLine , Criss will guest star in the two-part event, reuniting with Grant Gustin and Melissa Benoist after starring alongside the two in Glee."With our Flash and our Supergirl being Glee alums, how could we not have them go up against another Glee favorite like Darren Criss?" executive producer Andrew Kreisberg said to TVLine. "We have been blown away by his talent over the years and we can’t wait to see what he brings to the Music Meister."The Flash / Supergirl musical crossover will begin on March 20, during the end of Supergirl: Season 2's sixteenth episode. The second half of the two-part event will air the following day, on March 21, during episode 17 of The Flash: Season 3.The Music Meister's only previous appearance was on the the musical episode of Batman: The Brave and the Bold where he was voiced by Neil Patrick Harris. This led to speculation that Harris could play the role in live-action as well, something The Flash/Supergirl producers implied was a possibility , but ultimately Criss got the role.While you patiently wait for Barry Allen (Gustin) and Kara Zor-El's (Benoist) highly-anticipated showdown against Criss' Music Meister , here are a few details regarding what you can expect from the musical event

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