Watch The Simpsons Season 22 Episode 21 : 500 Keys Full Series Streaming

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The Simpsons Season 22 Episode 21 : 500 Keys
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Title:The Simpsons
Genre: Animation, Comedy
Air Date: 2011-05-15
Season Number: 22
Episodes Number: 21
Overview: 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.
Stars: Pamela Hayden (Milhouse Van Houten), , Russi Taylor (Martin Prince), , Maggie Roswell (Luann Van Houten), , Marcia Wallace (Edna Krabappel), , Tress MacNeille (Agnes Skinner), , Phil Hartman (Troy McClure), , Chris Edgerly (), , Hank Azaria (Apu), , Yeardley Smith (Lisa Simpson), , Julie Kavner (Marge Simpson), , Nancy Cartwright (Bart Simpson), , Dan Castellaneta (Homer Simpson), , Harry Shearer (Ned Flanders),