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"Treehouse of Horror XXIII" is the five hundred and tenth episode of The Simpsons, the second episode of the twenty-fourth season and the twenty-third installment in the Treehouse of Horror series.

We go back to ancient times when a Mayan Homer and Marge are witness to the prediction that 2012 will be the end of the world, the Springfield Subatomic Supercollider creates a black hole that terrorizes the city, a little unholy pact Marge when she was younger makes things go bump in the night and Bart travels to 1974 to buy a comic book at cover price but inadvertently disrupts Homer and Marge's courtship.