After helping his brother, Thomas Wayne, Jr., solve the crisis on two Earths, Bruce Wayne soon learns that a creature by the name of the Man-Bat is causing chaos in Gotham City left and right, just when Halloween rolled around at last. Along with this, Doctor Kirk Langstrom, one of the Doctors in Arkham Asylum, mysteriously went missing, with the Man-Bat having shed Kirk's Arkham attire. Now, Batman and Owlman must stop this creature from turning Gotham into a graveyard on a long, bloody Halloween...
