Bart and Milhouse convince Comic Book Guy to publish a comic book he wrote titled Everyman, in which the title character can absorb superpowers from the characters of comic book he touches. The comic becomes an instant hit, and many Hollywood studios become interested in making it into a movie. Comic Book Guy agrees to let Everyman become a movie, but only if he can pick the star. When Comic Book Guy sees Homer, he considers Homer perfect for the role, as he wants Everyman to be played by a middle-aged fat man. But the studio executives realize that audiences want a physically fit actor for the role, so they hire celebrity fitness trainer Lyle McCarthy to get Homer into shape. After a month, Homer becomes fit and the movie begins production.
Soon afterward, however, McCarthy leaves Homer for another client. Without McCarthy to keep him in shape, Homer starts eating again and gains all the weight back. Homer can no longer fit into his costume or even his trailer, and the movie begins to go over budget. The studio executives and Comic Book Guy worry that the film will not be successful. The final version of the movie features scenes with the fat Homer and the physically fit Homer merged, upsetting and confusing the audience. After the premiere of the film, McCarthy returns and offers to get Homer into shape again, which Homer accepts. The studio executives offer to let Comic Book Guy direct the sequel, on the condition that Comic Book Guy lie to the fans and say he liked the film. Though pleased by the offer, Comic Book Guy rejects it and openly criticizes the movie online, and thus it becomes a box office failure and Everyman is never adapted again.