In common with all of the previous Simpsons Halloween specials, the program is made up of three self-contained stories; "Send in the Clones", "The Fright to Creep and Scare Harms" and "The Island of Dr. Hibbert". In the first story, Homer Simpson gains the ability to clone himself but soon finds the clones impossible to control. In the second story, the town of Springfield is attacked by the zombies of famous deceased criminals. The final story, a parody of H.G. Wells' 1896 science-fiction novel The Island of Dr. Moreau and its various movie adaptations, involves people being transformed into animals.