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THE SIMPSONS: When Homer gets tossed in the slammer for a laundry list of criminal offenses in the New Year, he goes undercover for an FBI Investigator (guest voice Jon Hamm) in the all-new "Donnie Fatso" episode of THE SIMPSONS airing Sunday, Dec. 12 (8:00-8:30 PM ET/PT) on FOX. THE SIMPSONS ™ and © 2010 TTCFFC ALL RIGHTS RESERVED.