One of the more disappointing aspects of the "Invasion!" crossover event, which aired earlier this season, was that Martian Manhunter to travel to Earth-1 with Supergirl, so we never got to see David Harewood's Last Son of Mars fight alongside Grant Gustin's Scarlet Speedster and Stepehen Amell's Green Arrow.
CW won't make that same mistake in Tuesday's musical crossover, though. Check out the clip above to see Martian Manhunter properly introduce himself to Kid Flash/Wally West, Vibe/Cisco, and Caitlin Snow. He and Mon-El are in Earth-1 because they hope Team Flash can help them bring Supergirl out of the coma Music Meister put her in.
It then skips ahead to Martian Manhunter, Kid Flash, and Vibe confronting Music Meister, who taunts Wally about his recent visit to the Speed Force. How'd he know about that?!
DARREN CRISS (“GLEE”) GUEST STARS AS THE MUSIC MEISTER IN THE FLASH AND SUPERGIRL MUSICAL CROSSOVER – Barry (Grant Gustin) and team are surprised when Mon-El (guest star Chris Wood) and Hank Henshaw (guest star David Harewood) arrive on their Earth carrying a comatose Supergirl (guest star Melissa Benoist) who was whammied by the Music Meister (guest star Darren Criss). Unable to wake her up, they turn to Team Flash to save her.
However, the Music Meister surprises The Flash and puts him in a similar coma, one that Team Flash can’t cure. 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, complete with singing and dancing, to the end.
Dermott Downs directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Aaron Helbing & Todd Helbing.
Based on the characters from DC, The Flash is from by Bonanza Productions Inc. in association with Berlanti Productions and Warner Bros. Television, with executive producers Greg Berlanti (Arrow, Supergirl), Andrew Kreisberg (Arrow, The Flash), Sarah Schechter (Arrow, DC’s Legends of Tomorrow) and Aaron and Todd Helbing.
"Duet" episode of The Flash will air Tuesday, March 21 at 8 p.m. ET/PT.