- 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 was 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 it is actually a mutated creature. He 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 appeared in The Enchanted Franken-Forest. One of them appeared before the challenges started, where it burned 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. Again, Lightning got stuck near a fire breathing flower and this time 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 its 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 managed to gain 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 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. Two other 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 both 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 try 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 normal 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 swamp water.
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 were attacking the contestants during the challenge. Cameron noticed that the gophers couldn't see, but they could however 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 were floating on, causing them to land on the beach and win first place.
Although it makes its debut in Total Drama: Revenge of the Island, the giant octopus' tentacles are 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 a window by the raccoon.
A Giant Raccoon again appeared in Eat, Puke and Be Wary. Cameron and Lightning put their tracking collars on its tail. Chef then fired his spaghetti gun at the raccoon thinking it was Cameron and Lightning, but he was 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
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 with either 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 radiation, the seagulls now possess venom, fangs, and a rattlesnake's tail. 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. Because of the radiation, it has no hair, six legs, and glowing red 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.
The mutated squirrels are the most prominent mutant animal featured in Total Drama: Revenge of the Island. As a result of the radiation, these squirrels now blink their eyes vertically, are hairless, have long tongues, and shoot lightning-like bolts of electricity out from their eyes. Throughout the season, it torments the contestants by firing electrical bolts at them. It first appeared in Bigger! Badder! Brutal-er!, harassing the contestants the moment they arrived on the island.
In the beginning of Bigger! Badder! Brutal-er!, a mouse with an enlarged head appears under one of the beds in the cabins. It is seen again crawling around at the beginning of Ice Ice Baby. 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, while eating his breakfast, notices it scurrying around. He attempts to touch it, but the mouse becomes enraged and starts to levitate, causing 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, choosing to go for the frog, but after he catches it, the frog teleports both itself and Mike off of a tree into midair. Shortly afterward, it disappears, as Mike falls to the ground.
A giant tentacled alligator appears in The Treasure Island of Dr. McLean in the swamp. Zoey stands on it which angers it, causing the alligator to attack the contestants. It was later wrestled and defeated by a mutated Dakota. 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.
The same bird appears again in the next episode where Duncan has to face her in a boxing match. Despite giving out several threats, Duncan refuses 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.