The Simpsons: 500 Keys

When the Simpsons discover a collection of keys to every door in Springfield, Lisa stumbles upon an eerie hidden classroom beneath Springfield Elementary School. When she shares her discovery with Principal Skinner, the secret room mysteriously disappears and he takes the only key away. A determined Lisa uses her detective skills to lead her back to the room to solve an old school mystery.

Source: FOX

Currently 7.1/10
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7.1/10 (7 Votes cast)

Episode Info

Episode number: 22x21
Airdate: Sunday May 15th, 2011

Director: Bob Anderson (1)
Writer: John Frink

Guest Stars

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Main Cast

Dan Castellaneta voiced Homer Simpson, Abraham Simpson, Krusty the Klown, Barney, Willy, Sideshow Mel, Mayor Quimby, Hans Moleman, Gil, Itchy, Various	Julie Kavner voiced Marjorie "Marge" Bouvier Simpson, Patty Bouvier, Selma Bouvier, Jacqueline Ingrid Bouvier, Various
Yeardley Smith voiced Lisa Simpson, Various	Nancy Cartwright voiced Bart Simpson, Nelson Muntz, Ralph Wiggum, Todd Flanders, Kearney, Various
Hank Azaria voiced Apu, Moe, Chief Wiggum, Carl, Comic Book Guy, Dr. Nick Riviera, Prof. Frink, Cletus, Sea Captain, Kirk Van Houten, Various	Harry Shearer voiced Mr. Burns, Smithers, Dr. Marvin Monroe, Ned Flanders, Seymour Skinner, Otto, Kent Brockman, Dr. Hibbert, Lenny, Rev. Lovejoy, Various