Fan Casting Man Bat

Dr. Kirk Langstrom, a zoologist who specialized in chiropterology, developed an extract intended to give humans a bat's acute sonar sense and tested the formula on himself.[5] The extract worked, but it had a horrible side effect: it transformed him into a monstrous human/bat hybrid creature.[6] This side effect made him so distraught that it temporarily affected his sanity and he went on a mad rampage until Batman found a way to reverse the effects.[7] Later, Langstrom takes the concoction again and the Man-Bat returns. He also coaxes his wife, Francine Langstrom, into drinking the serum and she goes through the same transformation, becoming the She-Bat. Together, they terrorize Gotham City until Batman once again restores them to normal.[8]