Among the multiverse, on one fateful day, a family of three left their favorite movie theater in Gotham City. It is time to go home. They take a wrong turn into an unlit alleyway. A desperate man with a gun demands the group's valuables. A scuffle follows. Within seconds, Dr. Thomas and Martha Wayne are dead. Their son, Bruce Wayne has forever had his childhood stolen from him.
He became obsessed with the pursuit of justice and created a plan for the rest of his life. Once old enough, Bruce Wayne traveled the world and honed his body and mind to the highest physical peak. Along the way, he studied every known science including criminology, forensics, chemistry and psychology. Wayne trained under manhunters and martial arts masters and in time, became an unrivaled master, himself.
Probably the most unique version of Batman, Bat Boy is a Dwindled Dark Knight aided by his sidekick Rubin as they fight crime in Cosmopolis City. Bat Boy's utility belt hides various secret vials such as a secret gas that paralyzes gangsters, a secret gas that blinds gangsters, a secret gas that makes gangsters friendly, a Furshlugginer secret gas mask, a Bat-O-Lariet, spray deodorant, a secret gas that makes gangsters turn themselves in, a secret nine inch self-propelled artillery shell, hair brushes, an atomic bomb, and a conductor's puncher. However, Bat Boy is secretly a vampire. He uses the conductor's puncher to make two holes in his victim's big toe then drains their blood with a straw.