When temporal fractures begin causing erased memories, duplicated events, and impossible deaths across Central City, veteran speedster Barry Allen uncovers evidence that someone is systematically rewriting reality from inside the Speed Force itself. As fractured timelines unleash dangerous metahumans and collapsing alternate histories, Barry is forced into an uneasy alliance with Wally West to stop a terrifying new incarnation of Eobard Thawne — a parasitic temporal entity surviving by overriding human identities and manipulating history to psychologically destroy the Flash across every possible future.