Nancy Cartwright (born October 25, 1957) is an American film and television actress, comedian and voice artist. She is best known for her long-running role as Bart Simpson on the animated television series The Simpsons. Cartwright voices other for the show, including Nelson Muntz, Ralph Wiggum, Todd Flanders and Kearney and She does voices of others including Coop, Harley in Kid vs Kat but in 1996 Coop's voice was replaced by Nika Futterman Chuckie Finster in Rugrats and All Grown Up!, Margo Sherman in The Critic, Mindy in Animaniacs and Princess Lulu in Mike, Lu and Og.

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