Killer Croc is a fictional supervillain appearing in American comic books published by DC Comics, commonly as an adversary of the superhero Batman. The character was created by writer Gerry Conway and by artist Don Newton. The character's first appearance was a shadowy cameo in Batman #357 (March 1983), which was also the first appearance of Jason Todd. Killer Croc belongs to the collective of adversaries that make up Batman's rogues gallery.
Depicted as having a rare genetic condition that gives him a crocodilian appearance, sideshow wrestler Waylon Jones develops into a dangerous and animalistic criminal. The extent of his resemblance to a crocodile varies between merely a large man with hardened skin, and essentially an anthropomorphic crocodile with a snout and tail. The character is often portrayed as having cannibalistic tendencies.
The character has been adapted into various other media featuring Batman, including animated TV series and film, video games and novels. Adewale Akinnuoye-Agbaje will portray Killer Croc in the 2016 live-action feature film Suicide Squad.
The following is a list of characters that have appeared in the television series The Batman, which ran from September 11, 2004 to March 22, 2008.