Scientist Kirk Langstrom worked as a Zoologist at the Gotham City Zoo, experimenting with bat mutigene to create a serum to replicate the creatures' long life. After testing the serum on himself, Langstrom became the vicious ManBat. Though Batman eventually cured Langstrom, his obsession with the power of the ManBat 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 mutigene and also became a ManBat at one point.
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