Robbie Rotten is the antagonist on the children's TV show LazyTown. He tries to get the kids to eat junk food and is forever trying to banish Sportacus from LazyTown. He wants to make sure LazyTown stays lazy, like it was before Sportacus came to the rescue. He is known to be a master of disguise.
Robbie creates all sorts of plans, and sometimes comes very close to winning, but Sportacus always manages to save the day and stop his plans, with the help of Stephanie and her friends. The amount of effort that this champion of inactivity puts into his plots is ironically huge, he could easily be considered the most active person in LazyTown. Robbie Rotten is played by Stefán Karl Stefánsson.