Eobard Thawne offers Barry the chance to travel back in time to save his mother, but the consequences may be the loss of the entire world as Barry knows it.

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EPIC SEASON FINALE; VICTOR GARBER AND ROBBIE AMELL GUEST STAR - Wells (Tom Cavanagh) presents Barry (Grant Gustin) with a life-changing choice. Dr. Martin Stein (guest star Victor Garber) and Ronnie Raymond (guest star Robbie Amell) return to help the S.T.A.R. Labs team with this final fight. Dermott Downs directed the episode with story by Greg Berlanti & Andrew Kreisberg and teleplay by Gabrielle Stanton & Andrew Kreisberg (#123).