Season 22, Episode 21 500 Keys

First Aired: May 15, 2011

The Simpson family find a set of keys to every door in Springfield, which leads Lisa to discover a secret classroom beneath Springfield Elementary School.

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  • Premiered: December 17, 1989
  • Rating: TV-PG
  • Premise: Matt Groening's subversive, animated satire about Springfield's hapless first family became a cult favorite when it premiered on Fox in 1989 after first being seen in 1987 as a short on 'The Tracey Ullman Show.' That was then; now it's TV longest running c… (more)

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