Killer Croc

Killer Croc is a supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman. The character belongs to the collective of adversaries that make up Batman's rogues gallery. Originally a sideshow wrestler, Waylon Jones suffers from a rare genetic condition giving him a crocodile-like appearance. Driven insane by his irreversible transformation, he adopted the name "Killer Croc" and turned to a life of crime, over time developing animalistic tendencies which make him a dangerous individual.