Killer Croc is a fictional supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman. Killer Croc belongs to the collective of adversaries that make up Batman's rogues gallery.
The character has a rare genetic condition giving him a crocodilian appearance. Killer Croc's real name is Waylon Jones, and he was once a sideshow wrestler who developed into a dangerous and animalistic criminal in Gotham City. The extent of his resemblance to a crocodile varies between merely a large man with hardened skin and essentially an anthropomorphic crocodile. The character is often portrayed as having cannibalistic tendencies.