500 Keys
After finding the keys to every door in Springfield, Lisa finds a hidden room beneath the elementary school.
Aired: May 15, 2011 Genre: Animation ComedyCasts: Dan Castellaneta Julie Kavner Nancy Cartwright Yeardley Smith Hank Azaria Harry ShearerCreated By: Matt GroeningProducers: John Frink Bob AndersonRating: 7 Country: United States of America Production: Gracie Films, 20th Century Fox Television, 20th Television Animation, 20th Television
Seasons
Season 1Season 2Season 3Season 4Season 5Season 6Season 7Season 8Season 9Season 10Season 11Season 12Season 13Season 14Season 15Season 16Season 17Season 18Season 19Season 20Season 21Season 22Season 23Season 24Season 25Season 26Season 27Season 28Season 29Season 30Season 31Season 32Season 33Season 34Season 35Season 36Season 37Season 38
Episodes
01: Elementary School Musical02: Loan-a-Lisa03: MoneyBART04: Treehouse of Horror XXI05: Lisa Simpson, This Isn't Your Life06: The Fool Monty07: How Munched Is That Birdie in the Window?08: The Fight Before Christmas09: Donnie Fatso10: Moms I'd Like to Forget11: Flaming Moe12: Homer the Father13: The Blue and the Gray14: Angry Dad: The Movie15: The Scorpion's Tale16: A Midsummer's Nice Dream17: Love Is a Many Strangled Thing18: The Great Simpsina19: The Real Housewives of Fat Tony20: Homer Scissorhands21: 500 Keys22: The Ned-liest Catch
