21. 500 Keys (2011)
After finding the keys to every door in Springfield, Lisa finds a hidden room beneath the elementary school.
Release date: 2011-05-15
User rating:
7 / 10
19 votes
Season number: 22
Episode number: 21
Runtime: 23 minutes
Director: Bob Anderson
Writer: John Frink
Guest stars
Cast
Dan Castellaneta
as Homer Simpson / Abe Simpson / Barney Gumble / Krusty (voice)
Julie Kavner
as Marge Simpson / Patty Bouvier / Selma Bouvier (voice)
Nancy Cartwright
as Bart Simpson / Nelson Muntz / Ralph Wiggum (voice)
Yeardley Smith
as Lisa Simpson (voice)
Hank Azaria
as Moe Szyslak / Chief Wiggum / Apu / Comic Book Guy / Carl (voice)
Harry Shearer
as Ned Flanders / Mr. Burns / Smithers / Skinner / Lenny (voice)