The wedding of Barry Allen and Iris West has brought everyone together. However, things get messy, when evil visitors from Earth-X crash the wedding, forcing Team Arrow, Birds of Prey and Justice League band together against an entire world of their evil counterparts as the mightiest heroes of Earth-1 clash against the deadliest villains of Earth-X.

Sequel to ETERNAL FLAMES. Five months after the Undertaking, Sara seeks out Oliver to bring him back from his self-imposed exile to aid her save their city from the evil forces trying to take it over, as well as struggling with the sins and ghosts from their pasts that have come back to haunt them and threaten to destroy their lives and of everyone they care about.

Following the fall of the Green Arrow and his best friend, Tommy has been trying to make up for his past sins as Prometheus, taking on his role as the new guardian of Star City, even though it is not easy for him to forgive himself and his clashing interests with Team Arrow does not make things any easier. Though, they'll need to trust each other when new dangerous foes show up.