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The Flash – Season 3, Episode 17: Full Cast & Crew Aired Mar 21, 2017 Drama/Action/Adventure/Fantasy
Mon-El and Hank Henshaw arrive carrying a comatose Supergirl, who was attacked by the Music Meister; when the Music Meister attacks Barry, both he and Supergirl wake up in an alternate reality that they have to sing and dance their way out of. TV-PG Air Date: Mar 21, 2017 See TV Episode Details

Cast & Crew

All Cast Crew
Grant Gustin Barry Allen, The Flash Actor Candice Patton Iris West Actor Danielle Panabaker Caitlin Snow Actor Carlos Valdes Cisco Ramon, Vibe Actor Tom Cavanagh Dr. Harrison Wells Actor Jesse L. Martin Detective Joe West Actor Keiynan Lonsdale Wally West, Kid Flash Actor Tom Felton Julian Albert Actor Darren Criss The Music Meister Guest Star Chris Wood Mon-El Guest Star David Harewood Hank Henshaw Guest Star Melissa Benoist Supergirl Guest Star Greg Berlanti Executive Producer, Writer Andrew Kreisberg Executive Producer, Writer David Nutter Executive Producer Sarah Schechter Executive Producer Dermott Downs Director Aaron Helbing Writer Todd Helbing Writer