In "The Simpsons" episode "The Fight Before Christmas," airing Sunday, December 5 on Fox, singer Katy Perry stars in a live-action segment, with "The Simpsons" puppets:
"...It's beginning to look a lot like Christmas in 'Springfield', but while 'Marge' gets in the holiday spirit, it's bah humbug for the rest of the family. Disappointed that she is alone spreading the holiday cheer, Marge sends a letter to 'Martha Clause' (guest voice Martha Stewart) to help her save the family Christmas. Martha comes to the rescue and transforms the house into the North Pole chalet Marge has always dreamed of, but when the family is noticeably absent from the perfectly trimmed holiday home, she realizes that it's 'Homer' and the kids who make the holidays special.
"...Meanwhile, the Simpsons get ready to sneak away for a tropical holiday vacation in Hawaii, but surprise visitors 'Mr. Burns' and Katy Perry delay their getaway."
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