- Refer to this page for the animals that are not mutated.
The following is a list of mutated creatures that appear in Total Drama: Revenge of the Island and Total Drama All-Stars. After Total Drama Island, Camp Wawanakwa was heavily polluted, resulting in the mutation of its fauna. These mutants were transferred to the Fun Zone at Boney Island after the island has been cleaned.
The anglerfish creature is seen exclusively in Runaway Model, when the teams are supposed to go look for an animal to dress up for the challenge. It is a gigantic, bluish-green fish with small legs, and a beaver-resembling lure hanging from its head, possibly to catch food. Cameron sees the lure and thinks it's a beaver, but sees an actual mutated creature, then runs away with the rest of his team in fear.
A mutated purple fanged dragonfly appears in The Treasure Island of Dr. McLean. It grabs a frog by its tongue and carries it away.
A purple fanged frog is briefly seen in The Treasure Island of Dr. McLean. It tries to eat a dragonfly, but the dragonfly grabs the frog by its tongue and carries it away.
Mutated fire-breathing flowers appears in The Enchanted Franken-Forest. One of them appeared before the challenges started, and burns Lightning's butt. Another one tried to burn Cameron during the challenge, but Zoey hit it. Later on Lightning came across another fire breathing flower and a giant fly, but he managed to avoid the fire that the flower spit out of its mouth. Later, Lightning got stuck near a fire breathing flower and it burned his buttocks.
A fire-breathing flower later appears in the episode Sundae Muddy Sundae where it was planted in a pool of chocolate sauce that was part of the challenge. It burned a bear's fur off of it's body when it was seen in the beginning. The fire-breathing flower was later destroyed by Mal when he plugged a rock into it causing it to explode and burn up the chocolate sauce.
Fire-breathing winged mountain goats
The mutant goats appeared in Up, Up And Away In My Pitiful Balloon. After having their eggs stolen by Chef Hatchet, the goats attack the contestants out of revenge. After Zoey landed on one of them, she manage to gained control of them and order them to attack Scott for eliminating Mike in the previous episode.
Giant Beavers are not to be confused with the Woolly Beavers, as giant beavers have two tails, and have spikes on their backs, while Woolly Beavers have tusks.
A giant beaver is first seen chasing after Scott in Truth or Laser Shark, while he was looking for the McLean-Brand Chris Head. Other two giant beavers appear later as obstacles in the "Mad Skills Obstacle Course" as part of the challenge. Their role is to eat the support of some wooden platforms to make the contestants fall. They manage to make B fall, but he makes a female Giant Beaver out of mud to distract them. Later they capture Zoey and try to eat her, but she kicks them in the groin and they let her free.
Two giant beavers appear again in Runaway Model fighting with a two-headed bunny.
The giant beetle appears in the first challenge of Ice Ice Baby, acting as the 'guard dog' of the junk pile. When the contestants tried to take something from the junk pile it attacks them and breathes fire. Dawn then gives the beetle it's baby back and the giant beetle retreats. It later comes back in the second part of the challenge where Scott tells it to attack the other team.
Giant multiple-eyed chest-mouthed chicken
A giant mutated chicken with multiple eyes and a big mouth on its chest makes his first and only appearance in No One Eggspects The Spanish Opposition. It starts chasing Mike and Zoey after they try to steal its egg.
Another one appears in No One Eggspects The Spanish Opposition, when Mike and Zoey hide from it as it crawls past them.
A mutated fly appears in The Enchanted Franken-Forest. It attacks Lightning when he said that he wasn't afraid of it. Later in the episode Cameron comes across the fly and it suddenly falls in love with him and kisses his head. Cameron is finally saved by a mutant squirrel that ate the fly.
A Giant fly is briefly seen during The Final Wreck-ening, when a fly drops into the vat of acid, mutating into a giant fly, and then flying up to the lava pit and burning itself, before cooling itself off in the water section.
The mutated gophers live underground, and are enormous, hairless, and mostly blind. One mutated gopher appeared in the opening sequence of Total Drama: Revenge of the Island, popping out of the ground and roaring at Dawn causing her and other small animals to flee.
Lots of mutated gophers appeared in A Mine Is a Terrible Thing to Waste, some of them were under the ownership of Ezekiel, while others where attacking the contestants during the challenge. Cameron noticed that the gophers couldn't see, but they could smell them, and many gophers hated the smell of Brick's boot.
Four more gophers appear during the challenge in Suckers Punched as Cameron's opponent. All four of them crush him in a couple of seconds.
One of the octopus' tentacles smashes the dock and an intern at the beginning Bigger! Badder! Brutal-er!.
It then makes its official debut in The Treasure Island of Dr. McLean attacking the contestants in the water. Cameron tricked it in to attacking the piece of wood the Mutant Maggots where floating on, causing them to land on the beach and first place.
Although it makes its debut in Total Drama: Revenge of the Island, the giant octopus' tentacles is seen many times before this such as in the opening sequence of Total Drama Island and in Crouching Courtney, Hidden Owen.
In Backstabbers Ahoy!, a giant raccoon is used by Chris to scare the campers out of the Main lodge because their breakfast was cutting into time that could be used for the challenge. Once outside, Chris notices that Lightning is missing. Lightning is then thrown out of the window by the raccoon.
A Giant Raccoon again appeared in Eat, Puke and Be Wary. Cameron and Lightning put their tracking collars on it's tail. Chef then fired his spaghetti gun at the raccoon thinking it was Cameron and Lightning, but then proved wrong when it took Chef's gun and shoved his head in it.
Giant tree squid
The giant tree squids live in tree trunks, where they catch prey such as birds, as seen in Bigger! Badder! Brutal-er!.
Giant Venus Flytrap
The laser squirrels are the most prominent mutant animal featured in Total Drama: Revenge of the Island. As a result of the radiation, these squirrels are now hairless, blink their eyes vertically, having long tongues and even the ability to shoot laser beams out from their eye. Throughout the season, it torment the contestants by firing laser beams at them. It first appear in Bigger! Badder! Brutal-er!, harassing the contestants the moment they arrive on the island. Throughout the season, it torment the contestants by firing laser beams at them.
Literal "mutant maggots" roam the island in Total Drama: Revenge of the Island, large in size and with the ability to puke out slime from its mouth. The first actual maggot encountered by the campers is used by the Mutant Maggots team in Truth or Laser Shark during the second part of the challenge as a "baton" for them to pass through the obstacle course.
Another maggot appears in Runaway Model, also in association with the Mutant Maggots team. Cameron ends up choosing one as their model for the first challenge seeing it as the easiest animal they could get their hands on, ultimately dressing it in an early-60s style that doesn't go well either with the maggot or with the judges.
Three mutant piranhas appeared in the beginning of Backstabbers Ahoy!. They attacked Dakota when she was thrown in the water by Chris. They have spines now due to the mutation, and appear to be more aggressive.
Rattlesnake Seagulls make several appearances in the season. Due to the effects of the radiation, they now possessed rattlesnake's tail, fangs, and venom. The rattlesnake seagull first appears in Truth or Laser Shark, sleeping in the camp megaphone. But it is awoken when Chris sounds a buzzer.
The rattlesnake seagulls make a more prominent appearance in Backstabbers Ahoy!, as ammo for the challenge.
The roaches are seen exclusively in Grand Chef Auto where they were attacking and clinging on the contestants during the first challenge while they were searching for the keys.
A toxic rat is first seen in Truth or Laser Shark and is used by the Toxic Rats team during the "Mad Skills Obstacle Course" challenge as a "baton" for them to pass through the obstacle course. It has became hairless because of the radiations, has six legs and red glowing eyes. It is more aggressive than the "maggot baton" of the Mutant Maggots, as it often bites the contestants. A two-headed version of the rat appeared a season later in No One Eggspects The Spanish Opposition, when it hatches from an egg collected by the Heroic Hamsters.
In the beginning of Bigger! Badder! Brutal-er!, a mouse with an enlarged head appears under one of the bed of one of the cabins. It is seen again at the beginning of Ice Ice Baby crawling around. An eagle swoops down to pick it up, but the mouse's eyes glow green and it uses telekinesis to toss the eagle around. It then crawls into the Main lodge, where Cameron notices it scurrying around, while eating his breakfast. He attempts to touch it, but the mouse becomes enraged and starts to levitate, leading all of the campers to flee out of the lodge, except for Mike who gets thrown out the window.
A teleporting frog is seen exclusively in Runaway Model. Mike makes the first attempt to catch an animal for the challenge, but after catching it, the frog starts teleporting itself and Mike off a tree. Shortly afterward, it disappears, as Mike fell to the ground.
A giant tentacled alligator appears in The Treasure Island of Dr. McLean in the swamp. Zoey stands on it which then angers it, causing the alligator to attack the contestants. It was later defeated by Dakota (who is mutated) by wrestling it. Two smaller ones then attacked Lightning.
A three-eyed bird appears in No One Eggspects The Spanish Opposition when Duncan tries to steal her egg, promising that he will bring it back. When the bird begins to cry, Duncan starts crying too.
She later appears in the next episode where Duncan has to face her in a boxing match. Despite giving out several threats, Duncan refuse to fight a defenseless animal and forfeits the challenge. The bird then shares a confessional with him.
Three-eyed flying moose
A mutant two-headed bunny is seen exclusively in Runaway Model. It is seen punching a giant beaver in the forest.