The Simpsons: Season 22, Episode 21

500 Keys (15 May 2011)

TV Episode  |  TV-PG  |   |  Animation, Comedy
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Ratings: 7.2/10 from 447 users  
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While Homer takes the Duff Blimp for a joyride, Lisa discovers a secret room in the basement of Sprinfield Elementary School.



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Title: 500 Keys (15 May 2011)

500 Keys (15 May 2011) on IMDb 7.2/10

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Episode cast overview:
Homer Simpson / Wiseguy / Guy with a letter / Barney Gumble / Gil Gunderson / Mayor Quimby / Key Man (voice)
Marge Simpson (voice)
Bart Simpson / Todd Flanders / Nelson Muntz / Ralph Wiggum / Joe Spuckler (voice)
Lisa Simpson (voice)
Hank Scorpio (voice) (as A. Brooks)
Additional Voices (voice)


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. Written by Fox Publicity

Plot Summary | Add Synopsis


Animation | Comedy




Release Date:

15 May 2011 (USA)  »

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.78 : 1
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Did You Know?


When Homer is driving through "Suicidal Moron Pass", the license plate on the front of the car is NABF14, the production code for this episode. See more »


Marge Simpson: Stop, Pooter Toot! Other people might be offended by your slightly off-color antics.
See more »


Spoofs The Sweet Hereafter (1997) See more »


Bridal Chorus
Composed by Richard Wagner
See more »

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User Reviews

Great Episode,four stories
3 November 2011 | by (Ireland) – See all my reviews

500 keys is a great episode with a great storyline and two great side stories,there is usually only two stories but in this one we got four which I found great.

When Marge shows the family a box full of keys she and Homer found but never returned,so she gives a set of them to herself,Lisa,Bart and Homer separately.One of Lisas keys are a key to a unknown room in Springfield Elementary,which leads to a secret room no pupils ever knew about.Meanwhile,Bart has other plans and uses the keys for his own entertainment,which only leads to him doing good deeds.Meanwhile,one of Homers keys opens to the Duff Brewery and goes on the Duff Blimp (which Homer wanted to go on since Season 4s Lisa The Beauty Queen)and takes it around Springfield,but doesn't wanna get out,and finally one of Marges keys turn out to be a missing piece from a farting toy Homer got Marge for there anniversary,and the thing moves around farting all the way around town and Marge and Homer try to retrieve it.

1 of 4 people found this review helpful.  Was this review helpful to you?

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