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The Flash and Supergirl Get Retro Glam in First Musical Crossover Promo

The Flash and Supergirl Get Retro Glam in First Musical Crossover Promo

The Flash and Supergirl are going (old) Hollywood.

The first promo for the CW series’ upcoming musical crossover features a stylish Barry and Kara showing off their fancy footwork in a retro glamorous alternate reality.

RelatedFlash/Supergirl Musical Crossover’s ‘Alternate Reality’ Plot Revealed

The special event kicks off at the end of Supergirl‘s Monday, March 20 episode (airing at 8/7c), when the Music Meister (guest star Darren Criss) puts the Girl of Steel in a coma. Mon-El and Hank then travel to The Flash the following night, Tuesday, March 21 at 8 pm to seek out the help of the S.

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