'Mad Men' Gets the 'SpongeBob SquarePants' Treatment

Jon Hamm Will Voice Underwater Agency Chief Don Grouper

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Concept art for the upcoming episode.
Concept art for the upcoming episode. Credit: Nickelodeon

"SpongeBob SquarePants" is taking on Madison Avenue.

"Mad Men" star Jon Hamm will lend his voice to an episode of the Nickelodeon cartoon that will air next year, reprising his role as an ad executive.

This time instead of Don Draper, Mr. Hamm will play Don Grouper, "charismatic head ad executive of the ad agency Grouper, Goby & Koi," according to a Nickelodeon spokeswoman. "His sharp mind and devastating charm make him an irresistible force. When Don's in the room everyone laps up his words like overpriced organic honey."

In the episode, Mr. Krabs -- SpongeBob's boss at the Krusty Krab restaurant -- goes to Don for help with the launch of his line of frozen Krabby Patties.