Killer Croc

Biography
Born with a rare mutation that made his skin green and scaly, and which grew his body to grotesque proportions, Waylon Jones was raised by an alcoholic aunt and bullied relentlessly for his appearance. He briefly worked as a carnival freak under the name Killer Croc, but his misanthropy grew as did his bestial nature, pushing him to a life of crime. As his physical condition and mental state deteriorate, Killer Croc becomes a more bestial foe, increasingly detached from humanity.

Height: 8' 9"; 11ft (in game)

Weight: 310 pounds; 580 pounds (in game)

Attributes:
 * Killer Croc has incredibly thick, tough skin and razor-sharp teeth and claws
 * An expert wrestler, his strength and stamina are at a near-superhuman level
 * Heightened senses, and extremely fast reflexes
 * Able to survive in water for extended periods of time
 * An intense hatred of humanity
 * Cannibalistic

Batman: Arkham Asylum
Killer Croc was one of the many inmates of Arkham Asylum at the time. He resided in the sewer system of Arkham where the staff feed him meat and just try to "forget about him". When Batman was escorting the Joker through the Intensive Care unit, Killer Croc was being escorted by some of the staff (Including Louie Green), with a shock collar around his neck to keep him under control. Croc spotted Batman and claimed that he would hunt him down very soon. Croc was taken back to his lair when the Joker took control of the Asylum. He saw Batman passing by a locked door adjacent to the sewer. Croc punched the door's window, claiming that he would get Batman soon.

Eventually, Batman was forced to enter Croc's lair in order to retrieve the anti-Venom after his discussion with Poison Ivy. He followed the Scarecrow down into the sewers who threatened to dump his fear gas into the water supply, which would lead straight to Gotham's. Before he could do so, however, Croc jumped out of the water and grabbed Scarecrow. Batman attempted to subdue Croc by activating his shock collar with a batarang. Croc flinched for a moment before jumping back into the water, dragging Scarecrow with him. Batman made his way to Croc's lair, where Croc attacked him several times, only to be foiled by Batman activating his shock collar with batarangs. Eventually, Croc cornered Batman at the entrance of the lair and charged at him. Unbeknownest to him, Batman had laced the floor with his explosive gel and detonated it when Croc ran across it. Croc plummeted into the water below, vowing revenge on Batman.

In one of the three alternate endings after the credits, Killer Croc emerges from the water by the docks and grabs onto a floating case of Titan venom.

Batman: Arkham City
Croc remained in the Asylum sewers even after the events that transpired as a result of Joker's plans (implying that that the alternate ending depicting Croc was not canon). After Arkham City was completed and almost open for business, Hugo Strange sent TYGER Operatives to lure Croc out of the sewer system using human body parts as bait, which initially failed, but they were still able to capture Croc after the beast emerged from the sewers once the supply of bodies ran out. He was soon sent to Arkham City, where he roamed the sewers and subway system, murdering and feasting on anyone unfortunate enough to stumble upon him or his hideout. A hidden room can be found, which contains a dirty, broken down mattress, human skulls, and his collar, suggesting that Croc stayed there initially before roaming around the sewers freely.

Though Croc is not featured as a main character or adversary throughout the game, he makes a cameo appearance, though only at a specific point in the game's main storyline. After fighting Ra's al Ghul, Batman can throw a Remote Batarang at a switch behind a gate that leads to a sewer exit near the Sionis Steel Mill, at which point Croc will burst out of the wall behind it and attempt to attack Batman. Batman then states that he doesn't want to fight him and just wants to move through. Croc says that Batman's scent has changed and senses death on him (from the Titan poisoning Joker inflicted on him earlier), remarking that there is no need for a fight as he will feed on Batman's corpse once he dies.

Catwoman mentions Croc as an option to open Hugo Strange's vault. Catwoman and several other inmates then claim that Croc ate Scarecrow during the events of Arkham Asylum.

Challenge Maps
After the events of Arkham City, Killer Croc made his way to the Iceberg Lounge and watched Batman fight many of Penguin's men

Tape One
Warden Quincy Sharp: "Is he here yet?"

Aaron Cash: "He? You're kidding me, right? That thing's not a man."

(Killer Croc enters the room.)

Warden Quincy Sharp: "My God!"

Dr. Gretchen Westler: "Hello. My name is Doctor Gretchen Westler. Do you understand me?"

Killer Croc: "Yeah, I hear you b**** So, when's dinner? I'm getting hungry."

Tape Two
Dr. Gretchen Westler: "Taped patient session two, Patient's name: Waylon Jones AKA Killer Croc."

Killer Croc: "So is this the part where you try and reason with me? Find out why I did it, Doc?"

Dr. Gretchen Westler: "We're here to help you, Mr. Jones."

Killer Croc: "You got a cure for me then, Doc? Can you make me... normal?"

Dr. Gretchen Westler: "Normal is a poor choice of words. No one is really normal, are they?"

Killer Croc: "Figured as much. So how about this Doc? You let me go now, and I won't eat you."

Dr. Gretchen Westler: "You don't really eat people. It's just an urban myth."

Killer Croc: "You think? Keep believing that, Doc."

Tape Three
Aaron Cash: "Sit down and shut up!"

Killer Croc: "You think I'm scared of you, Cash? I've got your scent. you're..."

(Killer Croc is electrocuted by shock collar)

Aaron Cash: "And I've got yours too. Know what? It stinks. Carry on, Doc."

Dr. Gretchen Westler: "Please don't do that again, Mr. Cash. It's not helping. I'm sorry about the collar, but what can we do if you insist on hospitalizing three guards?"

Killer Croc: "Strap on whatever you like, Doc. This thing just tickles. I'm happy to wait here. Wait for the Bat. He'll be back and I'll kill him. Then Cash. Then you."

Aaron Cash: "In your dreams. Now get up. Now!"

Tape Four
Dr. Gretchen Westler: "Patient interview. Waylon Jones. Progress has been slow. What happened back in that house?"

Killer Croc: "Just business."

Dr. Gretchen Westler: "Business? What kind of business practices result in a house full of mutilated corpses?"

Killer Croc: "I don't like having my time wasted. Someone doesn't pay, they need a lesson. They owed me."

Dr. Gretchen Westler: "So you killed them. Tore up their bodies. The police never found all the pieces."

Killer Croc: "They should have looked in the sewers."

Dr. Gretchen Westler: "Are you saying you hid them there?"

Killer Croc: "After a while. Usually takes about 8 hours." *laughs*

Aaron Cash: "Time to go, Croc. Get up!"

Tape Five
Dr. Gretchen Westler: "Patient interview, Waylon Jones, AKA Killer Croc. Last night the patient was pacified after a break out attempt. Guard Aaron Cash is in hospital. Reports state that the patient attacked Cash and in the struggle consumed his left hand. Cash is lucky to be alive. He lost a lot of blood."

Killer Croc: "Me too, I nearly choked on that bony hand of his."

Dr. Gretchen Westler: "That's disgusting. He could have died."

Killer Croc: "He's just food to me. And once I get a taste, I want the rest of the meal. You know what I mean?"

Dr. Gretchen Westler: "Get him out of here, Now!"

(Security guards begin to drag Croc away.)

Killer Croc: "Got your scent too, lady! I'll see you around. Tick tock, Tick tock."

Psychological profile (by Dr. Penelope Young)
Psychological Profile: Jones was born with a rare mutation that created a series of physical disfigurements which have worsened intensely with age. His skin is green and scaly and his body has grown to grotesque proportions. While these disfigurements are unquestionably the sources of Jones' various psychological disorders, his intense misanthropy seems to also derive from an understably difficult childhood which included alcoholic relatives and social rejection by his peers. He increasingly embraces an animalist, subhuman conception of self.

Additional notes 

"His acute misanthropy makes him difficult to treat, he refuses to respond to socialization, reacting only when he is acknowledged as a dangerous beast, which is clearly how he views himself. It may be that his physical disfigurements are so severe, he will never be able to truly integrate into human society. This challenge is made clear by repeated (and occasionally successful) attempts to maim and kill the asylum's orderlies and doctors."

SPECIAL ENMITY WITH GUARD NAMED AARON CASH.

Batman: Arkham Asylum

 * "I will enjoy feasting on your bones."
 * "Tick Tock. Feed the Croc."

Trivia

 * If the player makes Batman move about after Killer Croc comes out of the elevator to spot him, Killer Croc's head will follow him no matter where Batman moves about.
 * In the beginning of the game, Joker can be heard saying, "Tick-tock, tick-tock, is that a crocodile I hear?" This is a nod to Peter Pan, which features a crocodile that at one point swallowed Captain Hook's alarm clock, causing people around it to hear the infamous ticking as it drew near.
 * In Arkham's Medical Facility's Sanatorium, an old prison cell is used as a Riddler Challenge puzzle to unlock Croc's Biography. It is presumed that this was his old cell or perhaps where he was kept when they studied him.
 * Croc is notably thinner in Arkham City, likely due to an inconsistent food supply.