What's a Halloween Countdown without a killer? Killer Croc, that is!
Known Aliases: Killer Croc, Croc, Crock Pot, Crocodile Dunderhead
Wanted for: Murder, kidnapping, extortion, and jaywalking. Also: eating puppies.
He is probably best known today for his appearances in the Batman: Arkham video games. But he first reached his widest audience outside the comics as a character in the legendary Batman: The Animated Series cartoon.
This version fortunately does not include a tail.
But he does have a thirst for human flesh!