Bart and Lisa see a commercial for an amusement park named Itchy & Scratchy Land, and immediately want to visit it. Marge has already booked a family vacation to a bird sanctuary, but after revealing that the theme park has a place for adults, Bart and Lisa win their parents over, on the condition that they will not embarrass Marge as on previous holidays. After a long car journey, they reach the Itchy & Scratchy Land parking lot, where they are then flown to the park by a helicopter and told by the pilot that nothing can "possibly" (he pronounces it "possi-bligh," then hastily corrects himself) go wrong.
Marge is slightly uneasy with the many references to violence at the park, but has an enjoyable time visiting the various violent attractions, which include a parade filled with Itchy and Scratchy robots. Homer and Marge eventually tire out and spend time away from the kids at the nearby "Parents Island" as Bart and Lisa continue having fun. Bart and Lisa also visit a movie theater, where a documentary about the history of Itchy & Scratchy is being presented, including clips of the old Itchy & Scratchy films "Scratchtasia" and "Pinnitchio". Although going well, the family's vacation is ruined when Bart launches a stink bomb into an actor's Itchy suit and is arrested by park security. When Bart arrives in a cell, he finds Homer, who is in there for kicking another Itchy character "in the butt." Marge is informed of her son's and husband's transgressions through the park's public address system and is immediately embarrassed.
Meanwhile, Professor Frink, chief of the animatronic robots in the park parades, tells the other staff that (according to chaos theory) all the Itchy & Scratchy robots will turn on their masters; this happens seconds after he makes the announcement. Bart and Homer are released and just as Marge is lecturing them, all power is cut and a horde of Itchy and Scratchy robots advance towards them. One of the park staff refuses to let them escape on the helicopter with them due to Homer and Bart's misdeeds at the park. Homer frantically throws everything he can at them and discovers that the flash of a camera short circuits the robots' systems. The Simpsons then grab dozens of cameras from a closed gift shop and defeat the entire Itchy & Scratchy army. The family is thanked for saving the park and agree that it was their best vacation ever. Regardless, Marge demands that they never speak of the trip again, as she is still embarrassed by the actions of Homer and Bart.