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