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Pariah enlists Black Lightning to help stop the Anti-Monitor; Flash-90 shares what he learned from his battle in Elseworlds; with the help of Black Lightning, Barry, Cisco and Killer Frost come up with a plan that could save them all.

After things take a dire turn with Despero, Barry meets Black Lightning at the Hall of Justice. Meanwhile, Iris suspects that something is off with Despero’s vision of the future, so she seeks help from a powerful ally. JACICIA LESLIE, CHYLER LEIGH and OSRIC CHAU guest star as Ryan Wilder, Alex Danvers and Ryan Choi.

Barry is shocked when Eobard Thawne returns in the most unexpected way; Damien Darhk offers advice to Barry, but there is a catch; an epic battle begins with Reverse Flash pitted against The Flash, Team Flash, Batwoman, Sentinel and Ryan Choi.