The Flash Cause and Effect (Season 3, Episode 21)
TV-PG
TV Episode | 42 min | Action, Adventure, Drama

The Flash

Cause and Effect (Season 3, Episode 21)

TV-PG

TV Episode | 42 min | Action, Adventure, Drama

Barry takes desperate measures to stop Savitar, while H.R. keeps pressuring Tracy Brand to set a trap for Savitar and Killer Frost has an interesting proposal.

Showrunners

Aaron Helbing | Todd Helbing

Director

David McWhirter

Writers

Greg Berlanti (developed by) | Andrew Kreisberg (developed by) | Geoff Johns (developed by) | Judalina Neira (written by) (executive story editor) & 2 more

Producers

Joseph Patrick Finn (produced by) (as JP Finn) | Aaron Helbing | Todd Helbing

Composer

Blake Neely

Cinematographer

C. Kim Miles

Casting Directors

Lyndsey Baldasare | David Rapaport (as David H. Rapaport)

See all filmmakers & crew (184)

Edit Released

Updated May 9, 2017

Release date

May 9, 2017 (United States)

Awards

Series awards

Nominated for 1 Primetime Emmy Award. Another 29 wins & 98 nominations

Contacts

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Cast	+ Add Cast
16 cast members

Name	Known for
Grant Gustin Barry Allen / The Flash / Savitar Barry Allen / The Flash / Savitar See fewer	The Flash (2014)
Candice Patton Iris West Iris West See fewer	The Flash (2014)
Danielle Panabaker Killer Frost Killer Frost See fewer	The Flash (2014)
Carlos Valdes Cisco Ramon / Vibe Cisco Ramon / Vibe See fewer	The Flash (2014)
Keiynan Lonsdale Wally West / Kid Flash Wally West / Kid Flash See fewer	The Flash (2014)
Tom Cavanagh H.R. Wells H.R. Wells See fewer	Ed (2000)
Jesse L. Martin Joe West Joe West See fewer	Rent (2005)
Tom Felton Julian Albert Julian Albert See fewer	Harry Potter and the Sorcerer's Stone (2001)
Anne Dudek Tracy Brand Tracy Brand See fewer	White Chicks (2004)
Danielle Nicolet Cecile Horton Cecile Horton See fewer	Central Intelligence (2016)
Richard Zeman Lucius Coolidge / Heat Monger Lucius Coolidge / Heat Monger See fewer	Brick Mansions (2014)
Andre Tricoteux Savitar Savitar See fewer	Deadpool 2 (2018)
Liam Hughes Young Barry Young Barry See fewer	The Flash (2014)
Sasha Rojen Young Iris Young Iris See fewer	The Flash (2014)
Ken Camroux-Taylor Judge Hankerson Judge Hankerson See fewer	Happy Gilmore (1996)
Tobin Bell Savitar (voice) (uncredited) Savitar (voice) (uncredited) See fewer	Saw (2004)