S22 · E21

500 Keys

2011-05-1523 min 7.0

← E20 Homer Scissorhands E22 The Ned-liest Catch →

Overview

After finding the keys to every door in Springfield, Lisa finds a hidden room beneath the elementary school.

Guest stars

Albert Brooks
as Hank Scorpio (voice)

Series cast

Dan Castellaneta
as Homer Simpson / Abe Simpson / Barney Gumble / Krusty the Clown / Groundskeeper Willie / Mayor Quimby (voice)

Julie Kavner
as Marge Simpson / Patty Bouvier / Selma Bouvier / Jacqueline Bouvier (voice)

Nancy Cartwright
as Bart Simpson / Maggie Simpson / Nelson Muntz / Ralph Wiggum (voice)

Yeardley Smith
as Lisa Simpson / Maggie Simpson (voice)

Hank Azaria
as Moe Szyslak / Chief Wiggum / Apu / Comic Book Guy / Carl Carlson / Superintendent Chalmers (voice)

Harry Shearer
as Ned Flanders / Mr. Burns / Smithers / Principal Skinner / Lenny Leonard (voice)

Crew

John Frink
Writer

Bob Anderson
Director