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The Simpsons Season 22 Episode 21

500 Keys

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.

May. 15, 2011

22 - 22
The Ned-Liest CatchMay. 22, 2011
22 - 21
500 KeysMay. 15, 2011
22 - 20
Homer ScissorhandsMay. 08, 2011
22 - 19
The Real Housewives of Fat TonyMay. 01, 2011
22 - 18
The Great SimpsinaApr. 10, 2011
22 - 17
Love Is a Many Strangled ThingMar. 27, 2011
22 - 16
A Midsummer's Nice DreamMar. 13, 2011
22 - 15
The Scorpion's TaleMar. 06, 2011
22 - 14
Angry Dad: The MovieFeb. 20, 2011
22 - 13
The Blue and the GrayFeb. 13, 2011
22 - 12
Homer the FatherJan. 23, 2011
22 - 11
Flaming MoeJan. 16, 2011
22 - 10
Moms I'd Like to ForgetJan. 09, 2011
22 - 9
Donnie FatsoDec. 12, 2010
22 - 8
The Fight Before ChristmasDec. 05, 2010
22 - 7
How Munched is that Birdie in the Window?Nov. 28, 2010
22 - 6
The Fool MontyNov. 21, 2010
22 - 5
Lisa Simpson, This Isn't Your LifeNov. 14, 2010
22 - 4
Treehouse of Horror XXINov. 07, 2010
22 - 3
MoneyBARTOct. 10, 2010
22 - 2
Loan-a-LisaOct. 03, 2010
22 - 1
Elementary School MusicalSep. 26, 2010