The Flash
After being struck by lightning, CSI investigator Barry Allen awakens from a nine-month coma to discover he has been granted the gift of super speed. Teaming up with S.T.A.R. Labs, Barry takes on the persona of The Flash, the Fastest Man Alive, to protect his city.
Season 3 · Episode 21 ·
Cause and Effect
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.
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Episode 21 of season 3 of The Flash: “Cause and Effect”. Aired 2017-05-09. Watch it online free on ZapFlix.