Stefán Karl Stefánsson (July 10, 1975 – August 21, 2018) was an Icelandic actor and singer, best known for portraying antagonist Robbie Rotten on the children's television series LazyTown.
Known For: Acting
Birthday: 1979-07-10
Place of Birth: Hafnarfjörður, Iceland
Also Known As: Stefán Karl, Stefán Stefánsson