Man bat
Dr. Kirk Langstrom was the resident authority on nocturnal mammals at the Gotham Museum of Natural History. Inspired by his admiration of the Batman, Langstrom hoped to give himself a natural sonar power like a bat’s by taking increasing doses of a compound he extracted from a certain gland in bats. Langstrom, succeeded, but to his horror, the compound also turned him into a grotesque bat-like creature. In this form Langstrom fought Batman and turned increasingly insane.

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