'Supergirl' and 'The Flash' Star in Musical Episode Duet

Exclusive Clip: Supergirl Takes On a Spaceship in

And after some incredibly dark times on both CW-DC series, the stars promise there's some lighthearted fun to be had when Kara (Melissa Benoist) and Barry (Grant Gustin) find themselves trapped in a unsafe dreamworld by the charismatic Music Meister (Darren Criss). What about the reunion of former "Glee" stars Darren Criss, Grant Gustin and Melissa Benoist?

A new villain comes to National City, putting Supergirl on high alert; at the same time, she faces an attack by the Music Meister. In contrast, he possesses a dark and sinister characteristic.

The next episode of "The Flash" and "Supergirl" is proving that musicals are not just escapism.

After airing an intense episode the previous week, the 17th episode of The CW's "The Flash" season 3 will be a lighter viewing experience. His appearance will be a burden for Barry because of his problems with Savitar. Presumably, the episode will let the audience enjoy the musical despite the unfortunate circumstances surrounding the two heroes. During his mission, Barry encountered the Speed Force, appearing to him in forms of people from his past. A speedster had to take Wally's place in the eternal prison, and though Barry wanted to sacrifice himself, Jay Garrick (John Wesley Shipp) ended up doing it instead. Darren Criss plays the Music Meister in Monday's "Supergirl" and in Tuesday's installment of "The Flash", and he brings about the whole music-pocalypse.

Hank Henshaw (David Harewood) enlists the help of Mon-El (Chris Wood) to ask assistance from Team Flash when they are unable to wake Kara up. The Music Meister is actually one of few characters who is featured in DC Comics, but didn't originate there. Team Flash can not cure Barry's comatose state. 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. "What I love so much about the musical is it really gives our characters an opportunity to address what they are going through".

Of course, they don't engage in all the singing and dancing voluntarily.

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