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.
Despero warns The Flash that great tragedies will lead to Armageddon; Barry doubles down on proving his innocence, but a devastating revelation pushes him to seek counsel from Black Lightning.
Jack reteams with Renee to chase dangerous leads. Then, President Taylor learns of a looming threat that seriously jeopardises the peace accord with Hassan.
Jack is set up, Renee makes a sacrifice, Dana sends her ex into a police warehouse, an arms trader deals with his sons, and the President buys time.
Jack goes undercover to retrieve deadly nuclear materials. Meanwhile, it's a political pressure cooker when President Taylor's goodwill comes under question.