DC3 Super Power Packs: Series Batman

Detective Comics (1937-2011) #400 (322/1026)

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.