Stephanie comes to LazyTown and meets a zany mix of townspeople, including the world's laziest super-villain, Robbie Rotten. Fortunately for Stephanie, LazyTown is under the watchful eye of Sportacus, an athletic, super-fit, hero, who runs, jumps, flips and flies to the rescue - he always manages to save the day and to help the kids of LazyTown foil Robbie's latest lazy schemes.
Stephanie throws a thank-you party for Sportacus, and she wants her friends to be on their best behavior. But Robbie appears as manners-expert "Miss Roberta” and teaches the kids to misbehave even more.
The LazyTowners give Sportacus the day off, but he just can't get used to relaxing. Robbie Rotten creates a vicious dog robot who chases everyone – including Robbie! It's up to "Sportastephanie" to stop Robbie's robot dog.
Robbie wins the election for Mayor by cheating and makes up new rules for LazyTown that encourage laziness. Mayor Meanswell becomes a spy and--together with Sportacus and the kids--try to foil Robbie's plan.