Pictured (L-R): Melissa Benoist as Kara, Grant Gustin as Barry Allen and Darren Criss as Music Meister -- Photo: Jack Rowand/The CW Photo

From: Photo Flash: First Look - Darren Criss, Jeremy Jordan & More in SUPERGIRL/FLASH Musical Crossover

The CW has released the first teaser for the 'Duet' episode as well as first look images - check them out below!