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Phil Hartman

Years on the show: 1986-94 Memorable role: Bill Clinton Away from "SNL": Phil Hartman co-wrote the screenplay for "Pee-wee's Big Adventure" and regularly appeared on the show "Pee-wee's Playhouse." He voiced many characters in "The Simpsons" animated series, including Lionel Hutz and Troy... NBC / NBC via Getty Images