Barry meets Black Lightning at the Hall of Justice after things take a dire turn with Despero. Iris suspects something is off with Despero's vision of the future so she seeks help from a powerful ally.
Quest roles:
Tom Cavanagh(Eobard Thawne / Reverse-Flash / Timeless Wells), Osric Chau(Ryan Choi), Cress Williams(Jefferson Pierce / Black Lightning), Ashley Rickards(Rosalind Dillon / Top), Chyler Leigh(Alex Danvers / Sentinel), Tony Curran(Despero), Javicia Leslie(Ryan Wilder / Red Death / Batwoman), Kalvin Olafson(Security Chief), Lisa Chandler(Hazmat Woman), Alexander Soto(Marcus), Christian Magby(Deon Owens / Negative Deon Owens), Paul Herbert(Director Hackshaw)