The CW has released the official press release for the 21st episode of The Flash season 3. The episode is titled “Cause and Effect”.
Barry (Grant Gustin) takes drastic measures to stop Savitar. Meanwhile, H.R. (Tom Cavanagh) continues to push Tracy Brand (guest star Anne Dudek) to design the trap for Savitar and Killer Frost (Danielle Panabaker) returns with an interesting proposal.
Judalina Neira & Lauren Certo written the episode directed by David McWhirter. The Flash Season 3 Episode 21 airs on May 9 at 8|7c on The CW.