After being disappointed by a new episode of Itchy & Scratchy, Bart and Lisa decide that they can write a better one themselves. Inspired by the sight of Homer accidentally slicing Marge's hair off with hedge shears, they write a script titled "Little Barbershop of Horrors", but their episode is rejected by Roger Meyers Jr., head of Itchy & Scratchy International. Correctly guessing that Meyers did not take them seriously because they were children, they resubmit the manuscript under Grampa's name, leading Meyers to hire Grampa as a staff writer. Bart and Lisa inform Grampa about what they did and the three of them conspire to continue passing off Bart and Lisa's scripts as Grampa's own, splitting the money three ways.
For his work on Itchy & Scratchy, Grampa is nominated for an award for Outstanding Writing in a Cartoon Series. When Grampa sees Itchy & Scratchy for the first time in a clip show introducing the award, he is appalled at the violent humor, and turns his acceptance speech into an assault on both the cartoon and the audience amused by it. He storms off the stage amidst boos and thrown vegetables. Grampa gives the award to Bart and Lisa, and Bart swears never to watch an award show again, unless Billy Crystal is featured.
In the subplot, Homer and Marge attend their "Class of 1974" high school reunion, where they have a great time and Homer wins a variety of humorous awards. However, Principal Dondelinger interrupts the ceremony to announce that Homer never graduated high school because he failed a remedial science course, leading Dondelinger to revoke Homer's awards. Determined to win back the accolades, Homer retakes the course and passes the final exam, finally graduating.
The conclusion of the episode features a brief segment, complete with its own theme song, entitled "The Adventures of Ned Flanders". In the sketch, Ned scolds his sons for failing to get ready for church, until they inform him that it is Saturday and the family laughs together.