Season 1, Episode 4 - "The Man Who Would Be Bat"
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 he will be feared. Man-Bat goes out of control and flies out into the city, feeding on animal blood.
