Detective Comics Vol.1 #400
Zoologist Kirk Langstrom is working late at the Gotham Natural History Museum putting together a bat habitat; he aims to perfect a serum that can endow people with enhanced auditory abilities via a specialized bat gland extract; Elsewhere in the city, a group of thieves known as the Blackout Gang break into a vault; Back at the museum, Kirk Langstrom is pleased with his progress and decides to test his new formula upon himself; he mutates into Man-Bat.
Printed: Jun 1970
Writers: Frank Robbins
Art: Neal Adams and Dick Giordano
Cover: Neal Adams