2007's The Simpsons Movie was an enormous success. Critics and fans generally enjoyed it, while it made a gargantuan $527 million against a reported budget of $75 million. So why hasn't there been a sequel? It's a topic that has come up a number of times over the years, and it did so again at San Diego Comic-Con this weekend. Simpsons creator Matt Groening said during a panel that it was a tremendously difficult challenge to make the movie, and it's not something that the production team...

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