Airdate: 2017-03-21 00:00:00
Runtime: 44 minutes
Rating(s): 6.1
Genre(s): Drama, Sci-Fi & Fantasy
Language(s): English
DescriptionBarry and team are surprised when Mon-El and Hank Henshaw arrive on their Earth carrying a comatose Supergirl who was whammied by the Music Meister. 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. The crossover starts on Supergirl S02E16 Star-Crossed (I).
Social| Cast 8 |
| Grant Gustin - Barry Allen / The Flash |
| Candice Patton - Iris West-Allen |
| Danielle Panabaker - Caitlin Snow / Killer Frost / Frost |
| Jesse L. Martin - Joe West |
| Tom Felton - Julian Albert |
| Tom Cavanagh - Harrison 'H.R.' Wells |
| Keiynan Lonsdale - Wally West / Kid Flash |
| Carlos Valdes - Cisco Ramon / Vibe / Mecha-Vibe |
| Guest Stars 10 |
| Darren Criss - Music Meister |
| Melissa Benoist - Kara Danvers / Supergirl |
| David Harewood - J'onn J'onzz / Martian Manhunter |
| Michelle Harrison - Nora Allen |
| Victor Garber - Digsy's Husband |
| John Barrowman - Cutter Moran |
| Jeremy Jordan - Grady |
| Chris Wood - Mon-El / Tommy Moran |
| Gili Roskies - Patron |
| Liam Hughes - Young Barry |
| Production 9 |
| Andrew Kreisberg - Executive Producer |
| Geoff Johns - Executive Producer |
| Melissa Kellner Berman - Executive Producer |
| David Nutter - Executive Producer |
| Todd Helbing - Co-Executive Producer |
| Greg Berlanti - Executive Producer |
| Sarah Schechter - Executive Producer |
| David Rapaport - Casting |
| Lyndsey Baldasare - Casting |
| Camera 2 |
| Jeff Cassidy - First Assistant Camera |
| C. Kim Miles - Director of Photography |
| Sound 1 |
| Blake Neely - Original Music Composer |
| Network 1 |
| The CW |
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