Detective Comics (1937-) #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. Pleased with his progress, he decides to test his new formula upon himself, mutating him into Man-Bat.

Written By:
Dennis O'Neil, Frank Robbins
Pencils:
Neal Adams, Gil Kane
Inks:
Dick Giordano, Vince Colletta
Cover By:
Neal Adams