The CW has released the official synopsis for “Cause and Effect,” the May 9 episode of The Flash.
 
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.
 
David McWhirter directed the episode written by Judalina Neira & Lauren Certo.
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