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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.

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  • Originally Aired May 15, 2011
  • Runtime 25 minutes
  • Content Rating United States of America TV-PG
  • Production Code NABF14
  • Network FOX
  • On Other Sites IMDB
  • Created August 28, 2018 by
    Administrator admin
  • Modified January 7, 2024 by
    tyeaan
Name Type Role
John Frink Writer
Albert Brooks Guest Star
Bob Anderson Director