A pink-haired girl named Stephanie moves to LazyTown with her uncle (the mayor of LazyTown), where she tries to teach its extremely lazy residents that physical activity is beneficial.
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.
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.
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.
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.
Robbie tricks the kids into going on a treasure hunt for the LazyTown Stone and then tries to steal it from them until Sportacus arrives to stop Robbie, much like a mysterious hero once stopped the famed Rottenbeard.
