After Homer accidentally pollutes the town's water supply, Springfield is encased in a gigantic dome by the EPA and the Simpsons are declared fugitives.
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The Simpsons Movie
I think once you've seen The Simpsons on TV you can pretty much expect much of the same on the big screen. The movie is actually pretty funny. Good to hear all the regular longtime 'voice' cast. Fans of the TV Series will not be disappointed.