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At the supermarket, Entrèe has a barcode on his butt scanned, and finds out that he is two days away from his "best before date", after which he will supposedly turn to mush. After a day of trying desperately to "turn back the clock", Entrèe switches places with Peri, pretending that Peri is Entrèe, with only a day to live. Peri, buying the deception, decides to destroy all of "his" stuff, and tells his friends what he really thinks of them, as read in "his" diary. When the time finally comes, Peri realises the truth, and Entrèe, instead of turning to mush, gains a hair-like growth of mould.

When Peri and Entrèe accidentally cause a Whirrel to destroy half the town, Joe loses his temper, demolishing the other half. The other mutants tell Joe that he needs to control his temper. Joe, hurt, leaves, declaring Peri and Entrèe the new mayors. In solitude, Joe hears from the bird on his back, Lord Wingus Eternum, who teaches him how to control his anger.

Patricia goes on vacation, reluctantly leaving Peri and Entrèe as housesitters. Peri and Entrèe end up turning the house into an indoor jungle, and when Patricia gets back, she is captured by her pet Molesters, who have turned into a savage tribe by their new environment. Peri and Entrèe mount a rescue attempt, but discover that the Molesters have actually made Patricia their queen.

Entrèe becomes obsessed with getting everyone to like him. An accident with a pair of very tight jeans makes him realise that the milk from his top-right udder, "Nugget", is very tasty. Everyone loves the "Nugget" milk, and Entrèe soon becomes incredibly popular, to the point where he shuns Peri. However, everyone else then becomes addicted to the milk, and when "Nugget" runs dry, they chase after Entrèe.

Entrèe's lucky stone goes missing and Peri is determined to find out who took it.

Compuhorse is boring. At least, that's what Peri and Entrèe think, until they discover his built-in videogame, Cubewhacker.

Peri and the others try to cheer Fuzzy up by making the island look like the long sought goal in Fuzzy's jungle journeys.

While Mister Smarty Smarts ponders where he went wrong after another plan ended in defeat, Octocat looks to carry out a plan of her own.

Entrèe makes promises to all his friends to get anything he wants but has no intention to keep the promises he makes. He soon makes one promise he regrets.

After a particulary exhausting day of stomping, Joe wakes up to find out that he can no longer stomp. Peri and Entrèe decide to help Joe find his stomp again, by bringing him to his "happy place". Meanwhile, Smarty Smarts capitalises on Joe's lack of stomping by using his "Cyber-Stomper" machine to terrorise the village.

Peri gains super powers after licking a glowing rock in the lab and Entrèe grows very jealous of him as a result.

Peri starts to move very fast from eating the sugar products received from doing favors for everybody. However, he soon realizes his speed comes with a price.

Peri gets a new pet, Pistachio the buppy. When Pistachio runs away, Peri is heartbroken. After visiting Compuhorse, Peri decides to not feel any emotions anymore, becoming "Compu Peri". His friends decide to try and snap him out of it.

Patricia is constantly distracted by the antics of the other islanders. She quickly loses her temper, threatening to beat everyone up if they don't let her work in peace. When Patricia tries to move on with her story, she experiences writer's block, and realises that her friends crazy antics actually gave her inspiration.

After their friends laugh at them for crying monster, Peri and Entrèe try to make a monster of a cute little mutant called Melvin.

Peri wakes up one day and finds he has turned completely pink but doesn't know how to handle the new look.

Peri and Entrèe find a remote that can control a local volcano. However, their playing with the remote drains the volcano of lava and leads to problems.

Entrèe decides to go on a mayonnaise only diet and this results in him bringing a jar of mayonnaise to life.

While trying to find batteries for a "Mr. Jigglesworth" toy, Peri and Entree find a pair of walkie-talkies, and use them to pull pranks on the other mutants. Soon after, though, Entree starts using his walkie-talkie to ask Peri for help with everything, causing Peri to discard his in anger.

Being chased by Wunny Sharbit, Peri manages to trap him in a glass tube, which he finds out has a translator device that allows Wunny to speak. Putting the translator around Wunny's neck, Peri takes it upon himself to teach Wunny the difference between friends and food.

Entree, desperate for respect, finds a helmet in the Doctor's lab, which teaches him kung fu. Entree is quickly corrupted by his new-found talent, and takes over the entire town, beating up anyone who challenges him. Peri uses the helmet to learn how to make ballon shapes, using this skill to defeat Entree.

After being tormented by Peri and Entree, Smarty Smarts and Joe go to their "happy place", only to find out that it is the same place. Realising that they share a mutual dislike of the annoying duo. The two become friends, pooling their resources to deflect Peri and Entree's antics, and pulling a few pranks of own.

After Entrèe laughs at Fuzzy Snuggums' latest attempt at exploring, Peri tells him that it's Fuzzy's dream. He shows Entrèe that Patricia and Joe have dreams too, but Entrèe scoffs, saying his only dream is to eat something delicious. After eating a pickled egg from the Doctor's fridge, Entrèe passes out. After waking up, he starts to hear a voice in his head telling him to do things.

When Mr. Smarty Smarts blames Octocat for all of his mistakes, she leaves and makes Peri her new master.

Entree is bored and decides to have fun on the island. Peri, Joe and Patricia stop him and he accuses them as fun wreckers. The next morning Entree jet-skis the island to Antarctica and the island is attacked by Yetis. Entree sees that Yetis can do whatever they want and decides to join them.

When Peri and Entree decide that they have too many things to do, they use one of the Doctor's old machines to make themselves some clones (Ponie and Underpants) to help them get things done. However, the two clones decide to take over Peri and Entree's lives forever.

While picking on a Whirrel named Ed, Entree and his victim fall off a cliff. The landing causes their brains to pop out and rebound into each others' heads. Entree quickly enjoys his new life as a Whirrel, and the unassuming Peri enjoys Ed's pleasant attitude. Entree is then ordered by a group of Whirrels to kill himself for his crimes against Whirrel-kind.

After a series of bad nightmares, Peri decides to use one of the Doctor's dream machines to enter his subconcious and confront his nightmare monster. However, once inside, he discovers that the toaster-headed monster isn't such a bad guy after all. Together with Entree and Patricia, they become "Dream Gladiators", protecting the dreams of all the mutants on the island.

After experiencing painful itching, Peri becomes a chrysalis, emerging to reveal a beautiful pair of butterfly wings, which entrance anyone who looks at them. Entree takes advantage of this by charging the other mutants food to look at Peri's wings. Mister Smarty Smarts tells Peri that Entree is using him, convinces him to banish Entree, and starts using him for his own nefarious goals.

Sick of the constant abuse Entree heaps upon them, his stomach, heart and brain suddenly jump out of his body, abandoning him. Entree then ingests Peri, having him fulfill the roles of his AWOL organs. After a few false starts, the arrangement becomes satisfactory for both of them. However, Entree's organs return, having outstayed their welcome by annoying everone else on the island.

After a busy day of helping the other mutants, Patricia creates "Mrs. Motherly", a computer system designed to help everyone on the island with everything. Mrs. Motherly's drones go off to help, but they soon start doing everything for the mutants. Tired of this, Patricia, Entree and Peri team up to shut down Mrs. Motherly.

Peri and Entree torment Fuzzy with a pranking game called "Island Fools", causing him to turn into a musclebound brawler, who sees every other mutant as a robot to be smashed. Knowing that only another super-soldier can beat a super-soldier, Joe tries to convince Octocat to fight Fuzzy.

When Peri and Entree fall in love with a pancake, they start to fight each other over it.

After being chased by the Wunny Sharbit, Peri and Entree get stuck up a tree. Entree makes a hanglider out of his chicken wings and promises to come back for Peri. But when a mysterious mutant hangs around town and becomes friends with Entree he forgets about Peri. After some time however, the new guy starts to torture Entree with a game called "you have betrayed me and now I will have my revenge".

Entrèe is very bored and decides a jetpack might cure his boredom.

After Entrèe gets into a fight with a Mole-Ster named Sid, Peri takes care of it. After a number of days Sid leaves. Meanwhile, Mister Smarty Smarts has developed a shrink ray, which he uses to shrink all the town members. Peri and Entrèe decide to ask the Mole-Sters for help.

Entrée time–travels with Patricia and Peri to find out why Two–Legs Joe doesn't like him.

Peri is feeling under the weather and his refusal to stay in bed leads to problems for everyone around him when his illness worsens.

After Lord Wingus Eturnium convinces Joe to go to the other side of the island (with "help" from Peri and Entrée) to meet with his kind, he is given a choice to have Joe separated from himself, but finds that it means having Joe ground off of him.

After Peri discovers that saying 'Poosh' can make Entrèe do anything he wants him to, he works him to exhaustion. When Patricia and Two-Legs Joe find out, they decide to send Peri on a quest for the Blagy Parble to give Entrèe time to rest.