When the Earth is enveloped by the Dark Multiverse, the Justice League is at the mercy of the Batman Who Laughs. Humanity struggles to survive in a hellish landscape twisted beyond recognition, while Batman, Wonder Woman, and Superman have all been separated and fight to survive. The heroes will need to fight their way across their demonic new home and come face-to-face with their entire history in order to stop the Batman Who Laughs once and for all.