Criss will be playing the Music Meister , a villain who was bullied for being in a choir (sound familiar?), but later found that his vocal range could hypnotize his victims. Think of him as a puppet master who controls people with a capella tunes. In past appearances, the character has been armed with a conductor's baton that shoots lasers, so there's that. Seems like perfect casting to us — Criss has been staying busy with stints on Broadway since he hung up his Warblers blazer. "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 told 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." There's no word yet on whether the episodes will feature original music or a mashup of Journey covers and Broadway standards. Either way, we'll be tuning in on March 20 and 21, when the two episodes are set to air.