An anonymous letter writer makes ominous threats to Bart. The Simpsons discover they were sent by Sideshow Bob who, when released from prison, harasses the Simpsons and then attempts to kill Bart with a machete. But Bob's vanity foils him yet again.
Homer is fired from his position in the power plant as Safety Inspector after a regulation inspector discovers he doesn't have certification for it. He goes back to college to get certified for his old job.
When Homer announces he would sell his soul for a donut, the Devil, disguised as Ned Flanders, shows up to take him up on the offer. Second Act, while ridings to school, Bart believe he sees a malevolent gremlin on the side of the bus. And final act, Mr. Burns is Dracula, in a spoof of Francis Ford Coppola's vampire film.
Bart wakes up after a sugar bender to find that he has joined the Junior Campers. Although he hates the club at first, he eventually grows to enjoy it. When a father/son rafting trip is announced, Homer unwittingly strands the group at sea.
Homer participates in a hidden camera investigation of unsanitary food preparation at the Kwik-E-Mart, which costs Apu his job. Apu then enlists Homer's help on a journey to India to get his job back, while James Woods becomes the new Kwik-E-Mart clerk, as part of his research for a film project.
The powers that be at NASA, distraught over low television ratings for their space launches, decide to improve them by putting a private citizen on their next space shuttle. After receiving an angry phone call from Homer, they decide he is their man.
After Ned Flanders helps Homer get tickets to an important football game, he and Homer become good friends. But Homer takes the friendship too far with his stupid antics, oblivious to the fact that Ned is beginning to hate him.
After winning a phone-in competition Bart has a choice of prize of either $10,000 or an elephant, he chooses the latter, naming him Stampy. The Simpsons are in chaos after Stampy wrecks the house and eats all the food. They have no alternative, Stampy must go to an animal refuge.
After a near-death experience, Burns holds auditions for his heir and after Bart smashes his windows he chooses Bart.Bart moves in with Burns but when he's forced to choose between Burns and his family he chooses the latter.
Bart takes Santa's little helper to school with him on inspection day and gets Skinner fired, Bart is pleased until Ned Flanders is made his replacement.Bart sets out to find Skinner and get him reinstated.
After playing hooky from school, Bart sneaks in to Mayor Quimby's nephew Freddy's birthday party and witnesses a confrontation between Freddy and a waiter, Freddy is accused of beating the waiter but Bart knows what really happened, should he keep quiet or tell the truth and risk getting Cort playing hooky?
Homer is given the task of teaching an adult education class about relationships. He fails to woo the class until he starts talking about his and Marge's sex life. When Marge finds out, she orders him not to talk about their private life again. But then he invites his entire class to dinner. This is the final straw for Marge and she chucks him out of the house. He then moves in to Bart's tree house. After seeing the error of his ways he asks Marge for a second chance. She accepts and the two reconcile.