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Bart Simpson (voice of Nancy Cartwright) is a loyal fan of children's television star Krusty the Clown (voice of Dan Castellaneta) -- "He's my idol! I've based my whole life on his teachings!" -- so he's understandably upset when Homer (also voiced by Castellaneta), while stopping at the Kwik-E-Mart on the way home, witnesses Krusty committing armed robbery. While Homer is certain of what he saw, Bart just can't bring himself to believe that the beloved entertainer is guilty. As Krusty awaits trial, his sidekick Sideshow Bob (voice of Kelsey Grammer) takes over the show, and turns the formerly lowbrow program into "The Sideshow Bob Cavalcade of Whimsy," complete with readings from The Man in the Iron Mask and music from Cole Porter. But Bart senses that some of the evidence presented against Krusty just doesn't add up, and with some help from Lisa (voice of Yeardley Smith), they find a way to clear Krusty's name and finger the real criminal. Krusty Gets Busted, the first of several Simpsons episodes featuring Kelsey Grammer as the devious Sideshow Bob, first aired on April 29, 1990.