Simpsonized Hamm will appear in one of the December episodes, as an investigator working with Homer.
"The Simpsons" fans get the first look of yellow Jon Hamm. While "Mad Men" is on a break, the actor is going to lend his voice for an FBI investigator in the December 12 episode called "Donnie Fatso".
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. "Homer goes undercover with Fat Tony's gang and Jon Hamm is his contact to the real world," executive producer Al Jean said. "He was hysterical."
A week before Hamm, Martha Stewart is going to visit Springfield in a Christmas episode. Playing Martha Clause, Stewart comes to the rescue and transforms the house into the North Pole chalet Marge has always dreamed of. "She's the fifth-richest person we've had on 'The Simpsons' and the sixth-funniest," Jean commented on Stewart.
The Martha Stewart episode will also feature a live-action Katy Perry and the muppet versions of Homer and co.