Fun with eight-year-old pink-haired Stephanie and superhero Sportacus as they learn how to make healthy choices and get active. Their friends include Ziggy, Stingy, Pixel and Trixie. Stephanie arrives for the summer, staying with her Uncle Milford. She meets the kids of LazyTown and hears about their superhero, Sportacus. Meanwhile, Robbie Rotten attempts to put Sportacus out of commission in various ways. It's up to Stephanie to rally her new friends and Sportacus to save the day.