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.
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Opensubtitles
22 - 1Elementary School Musical Sep. 26, 2010
22 - 2Loan-a-Lisa Oct. 03, 2010
22 - 3MoneyBART Oct. 10, 2010
22 - 4Treehouse of Horror XXI Nov. 07, 2010
22 - 5Lisa Simpson, This Isn't Your Life Nov. 14, 2010
22 - 6The Fool Monty Nov. 21, 2010
22 - 7How Munched is that Birdie in the Window? Nov. 28, 2010
22 - 8The Fight Before Christmas Dec. 05, 2010
22 - 9Donnie Fatso Dec. 12, 2010
22 - 10Moms I'd Like to Forget Jan. 09, 2011
22 - 11Flaming Moe Jan. 16, 2011
22 - 12Homer the Father Jan. 23, 2011
22 - 13The Blue and the Gray Feb. 13, 2011
22 - 14Angry Dad: The Movie Feb. 20, 2011
22 - 15The Scorpion's Tale Mar. 06, 2011
22 - 16A Midsummer's Nice Dream Mar. 13, 2011
22 - 17Love Is a Many Strangled Thing Mar. 27, 2011
22 - 18The Great Simpsina Apr. 10, 2011
22 - 19The Real Housewives of Fat Tony May. 01, 2011
22 - 20Homer Scissorhands May. 08, 2011
22 - 21500 Keys May. 15, 2011
22 - 22The Ned-Liest Catch May. 22, 2011
