Jon Hamm is set to reprise his role as Don Draper from Mad Men for a new TV appearance, but not in the way you might expect. Nickelodeon has announced that Hamm will play “Don Grouper” on an upcoming SpongeBob Squarepants special titled “Goodbye, Krabby Patty?”

To promote the episode, which airs on February 20, Nickelodeon has put out a teaser that shows a Mad Men take on the SpongeBob opening credits.

According to Entertainment Weekly, Grouper is hired by Mr. Krabs to help sell frozen Krabby Patties, and the sly marketing man is up to the task. Here is how he pitches the patty: “The Krabby Patty. Like an old friend. But not too old, because old is gross. Take a whiff at the future. Does it smell like money? It’s your dream come true.”

SpongeBob premiered in 1999 and is Nickelodeon’s longest-running animated show. Hamm is not the first celebrity to lend their voice to the show, as Ray Liotta, Amy Poehler, Patton Oswalt, David Bowie, Mark Hamill, and Johnny Depp all voiced characters throughout the years, according to BuzzFeed.

Here is what Don Grouper looks like on SpongeBob: