Kirk Langstrom - The Batman Season Five

After serving his sentence at Arkham Asylum for his crimes as Man-Bat, Kirk Langstrom was hired as a professor at Gotham University. During his tenure, three students infiltrated his lab, hacked his computer, and misappropriated his research on mutagenic chemicals for personal gain. 

When Batman and Batgirl visited him, Langstrom maintained his innocence and even assisted the heroes in uncovering the truth about his stolen files, thereby clearing his name. 

Utilizing a blood sample from "Gorilla Boy", Langstrom synthesized a fast-acting antidote to the mutagen, capable of reversing its effects within seconds of application.