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 networks as BBC, CBBC, CBS, Discovery Kids, Disney, RUV-Icelandic TV, and Nick Jr.