While investigating a mysterious metal connected to several events from his past, Batman discovers the existence of the Dark Multiverse, a collection of unstable worlds shaped by fear and the darkest possible outcomes. His investigation triggers the arrival of nightmarish versions of Batman from these realities, led by the Batman Who Laughs and connected to the cosmic entity Barbatos. As the Dark Multiverse threatens to consume Earth, Superman, Wonder Woman, and the Justice League must confront these monstrous counterparts and find a way to prevent the realities from merging. Batman’s discovery ultimately becomes a crisis capable of reshaping the entire DC Universe.