In Gotham, a city steeped in tension and haunted by tales of monsters, tormented scientist Robert Langstrom is kidnapped by the vampire known as the Mad Monk and given the ability to turn into a monstruous bat in moments of rage or stress. After escaping his captor, Langstrom, now known as Man-Bat, sets out on a quest for vengeance, exploring Gotham's shadowy underworld and encountering other hidden monsters. United by their suffering and desire for freedom, they join forces with Man-Bat in a desperate attempt to overthrow the Mad Monk and liberate Gotham from his reign of cruelty once and for all.
