The Simpsons Season 22 Episode 21 2010
7IMDB
The Simpsons Season 22 Episode 21: After finding the keys to every door in Springfield, Lisa finds a hidden room beneath the elementary school.
- Aired:May 15, 2011
- Seasons:38 · Episodes:816
- Country:United States of America
- Created by: Matt Groening
- Network:FOX
