The Batman - Season 1 Episode 4 -

A flock of bats lead Yin and Bennett to Wayne Industries, where Bruce has a scientist named Dr. Langstrom working on a project related to bats. In truth, Langstrom actually develops a serum that can turn him into the ""Man-Bat"", so people will fear him. Man-Bat goes out of control and flies out into the city, feeding on animal blood.