Bart and Lisa see a commercial for the new 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 Itchy & Scratchy Land parking lot, where they are then flown to the park by helicopter and told nothing can "possiblye" 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 the old Itchy & Scratchy film "Scratchtasia" is shown. Although going well, the family's vacation is ruined when Bart launches a stink bomb onto an actor in an Itchy suit and is captured by park security. Homer is also captured for kicking an Itchy in the butt. Marge is informed of her son's and husband's transgressions and is immediately embarrassed.
Meanwhile, Professor Frink, chief of the animatronic robots in the park parades, tells the other staff that (according to the 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 chewing them out, all power is cut and a horde of Itchy and Scratchy robots advance on them. 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 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, they decide to never to speak of the trip again.
Although the episode was quite difficult to animate, "Itchy & Scratchy Land" was "a dream come true" for the animators, as they quite enjoyed animating scenes filled with violence.
Itchy & Scratchy Land is mostly based on Disneyland, and several aspects of the park, such as the electric light parade, are parodied. The Euro Itchy & Scratchy Land is a parody of Disneyland Resort Paris, which at the time was a failing theme park known as EuroDisney. Several scenes, such as the helicopter ride, parts of the story, as well as the logo visible on the side of the helicopter are based on the Michael Crichton book and ensuing film Jurassic Park. Other parts of the episode, such as the "theme park of the future", are based on another Crichton story,Westworld. "Scratchtasia" is a reference to the Sorcerer's Apprentice segment of the Disney film Fantasia, with several shots and the music being exact parodies of the film. "Pinnitchio" is a parody of the 1940 Disney film Pinocchio. Hans Moleman being attacked by predatory birds while in the phone booth is a spoof of the 1963 Alfred Hitchcock film The Birds. Walt Disney's alleged antisemitism is spoofed in the character of Roger Meyers, Sr. Homer's Amish flashback recalls Peter Weir's 1985 film Witness.