Watch out, Homer -- maybe Marge will get "Knocked Up."
Comedian Seth Rogen will fulfill his dream role as a writer for FOX cartoon hit "The Simpson," penning an episode in which he'll also appear as a personal trainer whose goal is to whip tubby homer into shape.
Rogen, the star of comedies like "Knocked Up," "Pineapple Express" and super-hit "Superbad," said writing for the series is a lifelong goal that would be one of the highlights of his career.
"As a writer, it always just seemed like the Holy Grail," Rogen said of "The Simpsons."
"I can die a happy man now," Rogen said.
"Homer the Whopper" stars Rogen as Homer's trainer, who pushes Homer into physical shape to play Everyman, a superhero created by the show's character Comic Book Guy.
"We wanted to comment on how Hollywood generally ruins these movies. The whole joke is Homer is cast to play a guy who's an everyman and they try to make him into this physically fit guy," Rogen said.
Appearing on the show was "one of the highlights of my life," Rogen said.
"It was completely surreal. I was just in shock afterward. I felt like I had gone skydiving or survived an earthquake," he said.
Rogen is only the second visiting celebrity to both write and act in an episode, following in the footsteps of British comedy great Ricky Gervais.
His episode will air this Sunday, Sept. 27 at 8 p.m.