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In Season Four, the mission of Barry Allen, aka The Flash (Grant Gustin), is once more to protect Central City from metahuman threats. First, he'll have to escape the Speed Force. With Barry trapped, the job of protecting Central City falls to his family – Detective Joe West (Jesse L. Martin); his fiancée, Iris West (Candice Patton); and Wally West/Kid Flash (Keiynan Lonsdale) – and the team at S.T.A.R. Labs – Dr. Caitlin Snow/Killer Frost (Danielle Panabaker), Cisco Ramon/Vibe (Carlos Valdes) and brilliant scientist Harrison Wells (Tom Cavanagh). When a powerful villain threatens to level the city if The Flash doesn't appear, Cisco risks everything to break Barry out of the Speed Force. But this is only the first move of a life-or-death chess game with Clifford DeVoe aka The Thinker (Neil Sandilands), a mastermind who's always ten steps ahead of Barry, no matter how fast he's running.