Airdate: 2017-03-21 00:00:00
Runtime: 44 minutes
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 |
| Carlos Valdes - Cisco Ramon / Vibe |
| Danielle Panabaker - Caitlin Snow / Killer Frost / Frost |
| Tom Cavanagh - Harrison Wells |
| Tom Felton - Julian Albert |
| Jesse L. Martin - Joe West |
| Keiynan Lonsdale - Wally West / Kid Flash |
| Guest Stars 10 |
| Chris Wood - Mon-El |
| Darren Criss - Music Meister |
| John Barrowman - Malcolm Merlyn |
| Jeremy Jordan - Winn Schott |
| Victor Garber - Dr. Martin Stein |
| Melissa Benoist - Kara Danvers / Supergirl |
| Michelle Harrison - Nora Allen |
| David Harewood - J'onn J'onzz / Martian Manhunter |
| Carlos Valdes - Pablo |
| Candice Patton - Millie Foss |
| Production 6 |
| Andrew Kreisberg - Executive Producer |
| Geoff Johns - Executive Producer |
| David Nutter - Executive Producer |
| Melissa Kellner Berman - Executive Producer |
| Todd Helbing - Co-Executive Producer |
| Greg Berlanti - Executive Producer |
| Camera 2 |
| Jeff Cassidy - First Assistant Camera |
| C. Kim Miles - Director of Photography |
| Sound 1 |
| Blake Neely - Original Music Composer |
| Crew 1 |
| Justin Echevarria - Catering |
| Network 1 |
| The CW |
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