- Dan Castellaneta (Homer Simpson / Abe Simpson / Barney Gumble / Krusty the Clown / Groundskeeper Willie / Mayor Quimby (voice))
- Julie Kavner (Marge Simpson / Patty Bouvier / Selma Bouvier / Jacqueline Bouvier (voice))
- Nancy Cartwright (Bart Simpson / Maggie Simpson / Nelson Muntz / Ralph Wiggum (voice))
- Yeardley Smith (Lisa Simpson / Maggie Simpson (voice))
- Hank Azaria (Moe Szyslak / Chief Wiggum / Apu / Comic Book Guy / Carl Carlson / Superintendent Chalmers (voice))
- Harry Shearer (Ned Flanders / Mr. Burns / Smithers / Principal Skinner / Lenny Leonard (voice))
The Simpsons — S15E13
Episode: Smart and Smarter
Air Date: 2004-02-22
Runtime: 23 min
Overview
When Maggie does better than Lisa on an IQ test, Lisa becomes upset over no longer being the smart one and tries to lead Maggie astray.