Robert Underdunk Terwilliger, better known by his stage name Sideshow Bob, is a recurring character in the animated television series The Simpsons. He is voiced by Kelsey Grammer, and first appeared briefly in the episode "The Telltale Head". His first major appearance was in "Krusty Gets Busted". Sideshow Bob has been described as "Frasier pickled in arsenic", Frasier being Grammer's character on the series of the same name. In 2006, Grammer won an Emmy for Outstanding Voice-Over Performance for his portrayal of Bob in the episode "The Italian Bob"
