As he grew older, Waylon became bitter, developing into a violent and malevolent criminal and adopting a fearful name that matched his frightening appearance—Killer Croc. Waylon managed to engineer a career path that took him from sideshow wrestler to a formidable criminal figure in the Gotham City underworld, often finding himself at violent odds with Batman. And yet, perhaps because of his childhood, Waylon has a soft spot for abandoned and neglected children. He shelters many within his territory in the sewers of Gotham, something that has not gone unnoticed by the Dark Knight, who has demonstrated a bit more leniency with Croc over the years than with most of Gotham’s rogues.

Killer Croc possesses the traits of a crocodile in human form. His scaly skin is impenetrable and can deflect blows and bullets. His affliction affects his mind, too, meaning he’s sometimes driven by animal instinct that isn’t exactly rational. Super strength and endurance help him overpower his enemies, as does his sizable physique. And just forget about trying to beat him in a swimming match. Often, Croc's brutish behavior overrules sense, so if you do ever see him, we suggest backing away slowly and praying that he’s not hungry…