Batman: Legends of the Dark Knight Annual — DC Comics
Issue: #5
Prof. Langstrom turns into the Man-Bat for the first time! Lost in Gotham City as the Man-Bat, Langstrom goes to the Batcave, where he encounters Batman for the first time.
Creators: Chuck Dixon, Archie Goodwin, Willie Schubert, Enrique Quique Alcatena
Characters: Batman, Alfred Pennyworth, Man-Bat, Dr. Francine Langstrom
Story arcs: Year One