Man Bat is one of Batman's various adversaries, and is currently a member of the Organization by way of having his bestial evil side being removed and made into its own being.
Dr. Kirk Langstrom is a zoologist at the Gotham City Zoo. He first appeared in "On Leather Wings", where he steals a serum at the chemical labs. Langstrom also has a wife named Francine. One night, Langstrom drinks the serum, when Batman arrives to question him - revealing himself as the thief of the serum from the chemical labs. Langstrom transforms into a half-man, half-bat creature, and turns on Batman. Francine arrives at the lab and discovers that the creature is her husband. After a battle across the Gotham City skyline, the Man-Bat is knocked out and taken back to the Batcave. Batman manages to flush the formula out of Langstrom's system, and he is returned to his wife. Langstrom next appears in "Tyger, Tyger" where he analyzes the chemical that Dr. Emile Dorian used in his experiments. In the episode "Terror in the Sky", Langstrom is having a dream that he transforms into Man-Bat, and he begins to commit crimes. Then, Langstrom is awakened, just to find the remains of the fruit and scratches from a rag. Then, as Francine decides to go to another city due to Langstrom's inability to control the power of the Man-Bat, he then discovers that the other Man-Bat turns out to be Francine herself, accidentally exposed to an alternate man-bat serum. In the end, Batman cures Francine, and she returns to her husband.