The Simpsons - Season 22 Episode 21
After finding the keys to every door in Springfield, Lisa finds a hidden room beneath the elementary school.
- Genre: Family, Animation, Comedy
- Studio: FOX
- Keyword: nuclear power plant, middle class, cartoon, satire, parody, dysfunctional family, school, social satire, family, adult animation, sitcom, philosophical, kids, animation, witty, hilarious, admiring
- Cast: Dan Castellaneta, Julie Kavner, Nancy Cartwright, Yeardley Smith, Hank Azaria, Harry Shearer
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