A string of break-ins targets Arkham Asylum's sealed corridors. Detective Harvey Bullock follows the trail to a derelict room where he finds Dr. Jeremiah Arkham bound to a chair, a Man-Bat serum injector nearby, and a note signed by Bane: 'For Gotham's own good.' With the city's most dangerous minds as pawns, Bullock must unravel Bane's twisted scheme before the serum turns its first victim—and before Gotham pays the price for a madman's idea of salvation.
Amanda Waller has a new weapon: a chemically unstable Man-Bat, torn between man and monster. But when the serum shatters his mind, the creature breaks loose into Gotham. Batman must track the rampaging beast before it kills innocent lives. Meanwhile, Jeremiah Arkham watches from the shadows, convinced the chaos heralds an epidemic of madness. As the line between hunter and prey blurs, one question remains: who is the real monster?
When the Joker is found dead in Arkham Asylum, Batman must forge an uneasy alliance with Harley Quinn to investigate. Their search leads them to a secret experiment funded by Amanda Waller — a Man-Bat project that has birthed a creature capable of erasing Gotham's history itself. As landmarks vanish and memories fade, the duo races against time to stop the entity before the city loses everything that defines it. Can they uncover the truth before Gotham becomes a blank slate?
When Commissioner Jim Gordon is doused with a rogue batch of fear toxin, his world fractures: everyone he trusts becomes a monster, and the Batman himself morphs into a terrifying beast. Lost in paranoia, Gordon's only lifeline is Harley Quinn, who sees this as her chance to escape her past as a punchline. But can Harley navigate Gordon's shattered reality without losing him—or herself—in the process?
