When Stephanie arrives in LazyTown, to spend the summer with her Uncle Milford, she finds that she has trouble making friends because all the local kids spend all their time indoors playing video games. So, her uncle enlists the help of Sportacus, an athletic hero who encourages the kids to have fun by remaining active. Unfortunately, this doesn't sit well with Robbie Rotten, a lazy cheat, who takes pride in having LazyTown be the laziest town around, so he plots to get rid of Sportacus.

Robbie discovers that plenty of sleep gives people much needed energy, so he plots to rob Sportacus of his precious sleep so that he'll become weak and lose an upcoming baseball game.

The kids must face Robbie Rotten in a sports competition without the help of Sportacus after the villain causes the athletic hero to suffer a Sugar Meltdown brought on by a candy apple.

The kids are compelled to do whatever Robbie says and not question him when he disguises himself as Sportacus and gets them to act lazy.

Ziggy tosses out a toothbrush, a birthday gift from Sportacus, in favor of a taffy machine from Robbie Rotten. Soon, Ziggy is unable to stop the gadget when it begins to get out of control and covers LazyTown in taffy.

Sportacus loses his Crystal and offers a reward of one free wish to whoever finds it and returns it. Robbie sees this as the opportunity to get the free wish and use it to wish Sportacus out of LazyTown.

The kids join the Lazy Scouts, led by Scoutmaster Robbie, who promises to teach them the easy and lazy way to go camping. This doesn't sit well with Stephanie, especially when she discovers that the kids are ill-prepared for an oncoming storm.

Sportacus tries on a new pair of shoes, unaware that they are actually radio-controlled boots that Robbie will use to ruin Sportacus' athletic skills during Spectacular Sports Day.

Bessie's birthday cake turns up missing, and Robbie tricks everyone into believing that Sportacus stole it. The accusations land Sportacus in jail, so the kids get together to prove that he's innocent.

Ziggy tries to be a hero just like Sportacus, but his antics start getting him in trouble when he messes up the construction of the kids' new clubhouse.

Robbie causes panic in LazyTown when he disguises himself as Dr. Rottenstein and makes everyone believe that vegetables are at the root of a new disease.

A missing page from Stephanie's diary causes trouble amongst the kids.

The kids enter a treehouse building contest, but find it difficult working with Stingy because he doesn't know how to work as a team.

Pixel invents a machine that makes things vanish, and Robbie tries to get his hands on it so that he can get rid of Sportacus.

Pixel designs a LazyTown website about the town's residents, but neglects to include Robbie.

Robbie Rotten pretends to be the Mayor’s favorite rock and roll singer, Johnny B. Badd, so he can demand that Sportacus leave town.

When Robbie realizes that Sportacus started learning all of his hero skills when he was a boy, he turns Sportacus into a 10-year-old.

Stingy is tired of the mess in LazyTown and tries to get them to clean up all the garbage. But the kids aren't interested, and their mess continues to grow. Robbie overhears this and realizes that if he makes a huge mess in LazyTown, the kids won't be able to play any more.

When Mayor Meanswell goes away for the day to catch butterflies, Robbie decides to impersonate him and starts changing LazyTown’s rules – no more sports candy, and Sportacus must leave town forever!

The Mayor warns the kids to stay away from an old, unsafe castle, but Trixie ignores the warning and convinces the kids to join her inside, where Robbie poses as a ghost to scare them into not playing any more.

The Mayor has informed the kids that they can play outside, but they must read and pay attention to the signs – such as the one telling them to be cautious on the frozen lake. Robbie disguises himself as a snow monster in order to frighten the kids and stop them from playing outside in the snow.

The kids decide to create a circus in LazyTown. Robbie quickly formulates a scheme to blast Sportacus out of a cannon and out of LazyTown.

A competition is created in LazyTown where whoever wins gets a ticket to Sportacus' airship, but Robbie steals the ticket and attempts to let the air out of the ship.

Pixel has created LazyTown TV, a new TV station for the inhabitants of LazyTown to show off their talents.

As Stephanie and the others go to school, Robbie comes up with a plan to prevent the kids from learning, disguising himself as a teacher, and not teaching them lessons.

The town's residents have a disagreement on where Sportacus's birthday celebration should be held, while Robbie uses this to his advantage and builds a giant wall separating the town.

Mayor Meanswell plans to modernize the town, and Robbie uses this perfect opportunity to disguise himself as a technician to keep the kids busy and lazy with the new technology.

Pixel makes a machine where people can be scanned into the storybook, so Pixel scans Stephanie, Ziggy and Stingy into the book, and the story goes well until Robbie scans himself and disguises as a Wolf to change the story.

Stephanie and Ziggy decide to open a dance school in LazyTown. When Robbie learns of this, he disguises himself as the head of a famous dance school and invites Stephanie to join him far, far, away.

Robbie orders a robot which out-hero's Sportacus, so the kids will follow its lazy advice rather than Sportacus'.

It's Ziggy's birthday, so Stephanie organizes a surprise party for him, but Stingy doesn't want to go because he forgot to buy a gift for Ziggy.

Stephanie wants to give Sportacus a surprise present, but Robbie wants it, too. He decides to trick Sportacus, so he can get the present and keep it for himself.

The kids join Mayor's scout group and go on a Scavenger Hunt, but Robbie dresses as a Scout Master and replaces the treasures with unhealthy food.

Robbie creates a robot clone of Stephanie, which says horrible things about the LazyTowners.

A new museum opens in LazyTown, and the kids donate their valuables, where Stingy asks Sportacus to donate his crystal.

A suspicious inspector arrives after a valuable crystal is stolen from the museum.

While preparing for LazyTown's medieval festival, Mayor Meanswell tells the children the story of the famous Blue Knight and his rival, the Purple Knight.

It is the first day of Summer, and everyone heads to the beach, but Robbie wishes that everyone would leave town, so he could be on his own.

World-famous Mediterranean chef Pablo Fantastico is coming to LazyTown to show everyone his healthy recipes, but Robbie wants to put a stop to this, so he disguises himself as Pablo Fantastico and gets rid of the real one.

Pixel invents a new helmet that can turn people invisible. When Robbie gets his hands on it, he plots to get the mayor in trouble and use the helmet to keep Sportacus from rescuing the mayor.

It's Christmas in LazyTown, and the kids are very excited to receive their presents. When Santa arrives empty-handed, the kids go searching for the missing presents.

The kids are playing an astronaut's game, which inspires Robbie to move to the moon in order to get away from Sportacus and the noisy kids.

When the kids play a Secret Friend game, a misunderstanding makes Trixie lose trust in Stephanie and leave town.

Pinocchio shows up in LazyTown to help Robbie lie to the kids, convincing them to eat sugar gooey lollipops.

It's the last day of school, and the kids are excited to finish the big final exam, but Robbie has his own plans and gets Stephanie in trouble.

Robbie discovers that to make LazyTown lazy again, he needs to get rid of Stephanie, who wants to be a real princess.

Robbie impersonates Bobby Bird in a phone call and challenges Ziggy to a game of basketball.

Robbie disguises himself as a wizard while Stephanie and the mayor are away and makes a potion to make all the kids lazy.

Ziggy and Stingy put on a puppet show about a fortune-teller, but Robbie wants to use the opportunity to make them think there will be no more Sportacus.

Trixie acts as a ghost at school and scares Ziggy, so Robbie decides to disguise himself as a ghost to scare the kids out of school.

Robbie orders an Egyptian Pyramid with the hope of trapping Sportacus inside.