For years Kirk Langstrom has struggled with his monstrous alter ego, Man-Bat, and the serum that transformed him. But he's finally hit rock bottom following a devastating setback, and he's going to take his anger out on every single citizen of Gotham City. Will the combined might of Batman and the GCPD be enough to stop Langstrom once and for all? Or will this just be the start of Man-Bat's devastation?