<iframe src="http://www.npr.org/player/embed/12253984/12253988" width="100%" height="290" frameborder="0" scrolling="no">
Nancy Cartwright's work is widely heard and well loved, but not many people know it's her. She's the voice of Bart Simpson on TV's The Simpsons — and in the long-awaited feature film that hits theaters this week.
NPR thanks our sponsors
Become an NPR sponsor
Support The Programs You Love