When Stephanie arrives in LazyTown to stay with Uncle Milford, she finds that she has trouble making friends because all the local kids spend all their time indoors playing videogames. 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 10.