Robert Underdunk Terwilliger, better known as Sideshow Bob, first appeared in the animated television series The Simpsons in 1990. He began his career as a sidekick on Krusty the Clown's television show, but after enduring constant abuse, Bob attempted to frame his employer for armed robbery. The plan was foiled by Bart Simpson, and Sideshow Bob was sent to prison. In each appearance thereafter, Bob has assumed the role on The Simpsons of an evil genius.
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