Man-Bat (Batman: The Animated Series)

Scientist Kirk Langstrom worked as a Zoologist at the Gotham City Zoo, experimenting with bat mutagen to create a serum to replicate the creatures' long life. After testing the serum on himself, Langstrom became the vicious Man-Bat. Though Batman eventually cured Langstrom, his obsession with the power of the Man-Bat compelled him to take the serum again and again. Francine, Langstrom's wife and colleague, was accidentally cut by a sliver of glass from a vial which contained the bat mutagen and also became a Man-Bat at one point.

History
In Batman: The Animated Series, Dr. Kirk Langstrom (voiced by Marc Singer) 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. Langstrom is cured and returns 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.

The New Batman Adventures
When Batman: The Animated Series was revamped into The New Batman Adventures,Langstrom as Man-Bat never appeared in the new show.However, Langstrom did make a cameo in Bruce Wayne's wedding in the episode "Chemistry",so he appears to be finally cured. In the comic Batman Gotham Adventures which is based on the show he makes an appearance in issue #18.

In the Justice League Unlimited episode "The Doomsday Sanction", Professor Milo mentions that Dr. Langstrom's research has proven useful to his experiments splicing together human and animal DNA for the Cadmus Project. This ended with a disaster when a mutated warthog was mentioned to have destroyed his lab.