Batman is an ongoing
American comic book series featuring the
DC Comics hero of the
same name. The character first appeared in
Detective Comics #27 (
cover dated May 1939). Batman proved to be so popular that a self-titled ongoing comic book series began publication with a
cover date of Spring 1940. It was first advertised in early April 1940, one month after the first appearance of his new sidekick,
Robin, the Boy Wonder.