Waylon Jones

Born with creppy, scaly skin, Waylon Jones' resemblance to a crocodile gained him cruelty from his peers and the world around him. As Waylon grew, his crocodilic appearance did too, and his only choice was to become a circus act (Haly's?)

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Early Life
The Bounty

Initially a low level goon with a lot to prove and nothing to lose, "Killer Croc" was eager to make his name in the Gotham underworld by claiming the open bounty for killing The Batman.

Batman vs Jason: Jason Takes Gotham

Locked in Arkham Asylum, after getting in a scrape with Jason Voorhees, Croc escapes to hunt him down and slay him. In the sewers of Gotham, the two clash again, only for Croc to find Jason to be an equally capable fighter and swimmer.

Knightfall

When a new player named Bane takes Gotham's supervillain world by storm, Croc is eager to knock him down to Earth, only to have his arm broken in the resulting fight.

The Dark Knight Returns

Now almost fully a creature more than man, Croc inadvertently hurts some people, and Batman tracks him down, only to find he is making his way to Swamp Thing in the Green. Batman helps Croc find his peace, Swamp informs him that he is fading and he needs help finding a new defender of the green, and Batman brings him Poison Ivy.