The Flash Season 3 Episode 21 Cause and Effect ( Air Date 2017-05-09 ) Genre Drama, Sci-Fi & Fantasy category. Overview "Barry takes drastic measures to stop Savitar. Meanwhile, H.R. continues to push Tracy Brand to design the trap for Savitar and Killer Frost returns with an interesting proposal.".
The Flash Season 3 Episode 21 Cause and Effect
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- Watch: The Flash Season 3 Episode 21 Cause and Effect on CWR-CRB
- Stars: Grant Gustin, Candice Patton, Danielle Panabaker, Danielle Nicolet, Kayla Compton, Brandon McKnight, Jon Cor
- Director: Vanessa Parise, Carrie Stula, Emily Palizzi, Jeff Hersh, Christopher Gordon, Jen Synnott, Sarah Tarkoff, Brie Thorpe, Joshua V. Gilbert, Emily Mason, Lukia Czernin, Thomas Pound, Catou Kearney, Kristen Kim, Jess Carson, Starlette Tolver, Rosie Lobb, Eric Partridge, Dan Fisk, Michelle Bartolo, Mike Tanassee, Justin Kohler, Simon Smith, Michael Mullane, Sam Chalsen, Aaron Levy, Corrie Alexander, Dani Dornfeld Yaroslow, Simone Gore, Andy Bishop
