After Ralph sacrifices himself to stop the destruction of Cicada’s dagger, Team Flash discovers the weapon’s connection to Barry’s oldest foe — the Reverse Flash. But they must locate Grace before she travels even further back in time.

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BARRY FACES OFF WITH REVERSE FLASH

Barry (Grant Gustin) faces off with his oldest, and most formidable nemesis, Reverse Flash (Tom Cavanagh).

Gregory Smith directed the episode with story by Lauren Certo and teleplay by Todd Helbing & Eric Wallace (#522).