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

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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: Nancy Cartwright (Bart Simpson / Nelson Muntz / Ralph Wiggum / Todd Flanders / Kearney / Various (voice)), , Dan Castellaneta (Homer Simpson / Abraham Simpson / Krusty the Klown / Barney / Willy / Sideshow Mel / Mayor Quimby / Hans Moleman / Gil / Itchy / Various (voice)), , Julie Kavner (Marge Simpson / Patty Bouvier / Selma Bouvier / Jacqueline Ingrid Bouvier / Various (voice)), , Yeardley Smith (Lisa Simpson / Various (voice)), , Pamela Hayden (Milhouse Van Houten), , Harry Shearer (Mr. Burns / Smithers / Dr. Marvin Monroe / Ned Flanders / Seymour Skinner / Otto / Kent Brockman / Dr. Hibbert / Lenny / Rev. Lovejoy / Various), , Hank Azaria (Apu / Moe / Chief Wiggum / Carl / Comic Book Guy / Dr. Nick Riviera / Prof. Frink / Cletus / Sea Captain / Kirk Van Houten / Various), , Russi Taylor (Martin Prince), , Maggie Roswell (Luann Van Houten), , Marcia Wallace (Edna Krabappel), , Tress MacNeille (Agnes Skinner), , Phil Hartman (Troy McClure), , Chris Edgerly (), , Julie Kavner (Patty and Selma),