Robbie Rotten is the main antagonist of the childrens' television show, LazyTown. He is determined to make LazyTown quiet and lazy, as it was before the arrival of Sportacus and Stephanie. In fact, Robbie is determined to run Sportacus out of LazyTown outright, as his championing of a healthy lifestyle and physical-exercise goes against Robbie's goals for the future.
Robbie devises all sorts of plans to achieve these objectives, sometimes coming close to succeeding, but in the end, like almost all villains in children's television, is always defeated by the show's protagonists. He even built a robotic dog named Robo-Dog to aid him.
The amount of effort that Robbie puts into his plots is ironic, since in his efforts to make everyone lazy he has become one of LazyTown's most active citizens.
Although his villainy is limited due to the show being geared towards a young audience, he is shown to be the most sneaky, nasty and potentially "evil" of all LazyTown's residents - having his own underground lair equipped with a periscope and various gadgets.
Robbie is a master of disguise, frequently employing varied guises to cause mischief and trouble, and he often shows the typically villainous trait of determination to succeed at his cause despite his repeated failings.