斯特凡·卡德尔·斯特凡松，Stefan Karl Stefansson is an Icelandic film and stage actor/comedian, best known for playing the villain Robbie Rotten of Nickjr's popular TV program Lazy Town, that currently airs worldwide in over 103 countries, in all five continents, on [such distinguished] networks as BBC, CBBC, CBS, Discovery Kids, Disney, RUV-Icelandic TV, and Nick Jr.