Killer Croc (Waylon Jones) is a fiction character in the DC Universe, an enemy of Batman. Created by writer Gerry Conway and artist Gene Colan, he first appeared in Batman #357.
In Croc's initial string of appearances — a Detective Comics story arc that culminated in Jason Todd adopting the mantle of Robin — he was depicted as an unnamed, shadowy figure in a trenchcoat. A ruthless criminal who wants to become the crime kingpin of Gotham City, Croc works behind the scenes using methods like sniping to eliminate his criminal competitors. He briefly unites a small army of Batman villains under his leadership. When Batman finally confronts his mysterious foe, the villain is revealed to have a massive physique and reptilian appearance. It is then revealed that his real name is Waylon Jones, born with a form of atavism that imparted him with reptilian traits. His parents grew to loathe their child's hideous appearance and brutal behavior. While still an adolescent, his father abandoned him in the wilderness. Croc survived, becoming a career criminal. Batman and the new Robin defeat him after a desperate battle.
In these original, pre-crisis appearances, he resembled a powerfully-built man covered entirely in green scales, but was still basically human in his facial proportions and build. Over the years, writers have discarded the original conception of Croc as a crime lord; for instance, Killer Croc was originally depicted as gunning down Jason Todd's parents (this was later retcon to make Two-Face their murderer). His appearance and personality have become increasingly bestial, explained in the comics that his disease has slowly robbed him of all identifiable human traits. In his most recent appearances, he has an elongated snout and tail.
In Batman #489, Killer Croc attacks a shopping mall. After delivering several blows to Croc, Batman (this was Jean-Paul Valley's first appearance as Batman) is distracted by a glimpse of Bane; Croc then grabs Batman and tries to break his back. He fails, and Bane pits himself against Croc, breaking his arms. He is then put back into Arkham Asylum.
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Official Site: DC Comics
Links: Killer Croc Wiki Entry DC Guide.com Batman The Animated Series.com