500 Keys500 Keys (2011) Season 22 Episode NABF14- The Simpsons Cartoon Episode Guide by Dave Koch
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- The Simpsons Cartoon Episode GuideEpisode GuideTelevisionSeriesCartoon
- Gracie Films
- Animation Studio: Film Roman
- Distributed by: 20th Century Fox Television
- Cartoon Characters: Homer Simpson, Wiseguy, Guy With a Letter, Barney Gumble, Gil Gunderson, Mayor Quimby, Key Man, Marge Simpson, Bart Simpson, Todd Flanders, Nelson Muntz, Ralph Wiggum, Joe Spuckler, Lisa Simpson, German Biker, Chief Clancy Wiggum, Kirk Van Houten, Professor Frink, Duffman, Irritable Bowel Syndrome Support Group Man, Superintendent Chalmers, Cletus Spuckler, Snake, Ned Flanders, Dr. Hibbert, Reverend Lovejoy, Principal Seymour Skinner, Otto Mann, Hank Scorpio, Milhouse van Houten, Rod Flanders, Irritable Bowel Syndrome Support Group Woman, Nancy Drew, Brandine Spuckler, Mary Anne, Agnes Skinner.
- Voice Actors: Dan Castellaneta, Julie Kavner, Nancy Cartwright, Yeardley Smith, Hank Azaria, Harry Shearer, Albert Brooks, Pamela Hayden, Tress MacNeille; Full Voice Cast ...
- Directed By Bob Anderson.
- Produced By Bill Oakley, Josh Weinstein, Al Jean.
- Written By John Frink.
- First Aired on May 15, 2011.
- Originally Aired on FOX TV (USA).
- Running Time: 30 minutes.
- Episode Number: NABF14
- Season: 22
The family discovers 500 old keys in a drawer and tries to find out what they do. Lisa uncovers a shocking mystery in the basement of the school.
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