Bart, Lisa, and their classmates board a school bus to attend a statewide Model U.N. meeting. As Otto is driving across a bridge, he loses control of the bus and it smashes through a guard rail. The vehicle plunges into the sea and begins taking on water. Students bail out and swim towards a nearby island. Meanwhile, Homer learns that Ned Flanders and his wife have begun their own business on the Internet. Intrigued, Homer decides he will create a home business of his very own.

Bart’s fantasy of creating a Swiss Family Robinson-like island lifestyle vanishes after the children discover food, shelter and monkey butlers are in short supply. Later, while exploring
the island’s woods, Milhouse encounters what he describes as a monster—but the other children dismiss this as a figment of his imagination. As hungry stomachs begin rumbling, Bart employs an asthma inhaler as a makeshift air tank. He reaches the sunken bus and recovers a cooler filled with food. Lisa carefully manages the rations, but the next morning the students discover the cooler empty—and a sleeping Milhouse surrounded by empty food wrappers.

Billionaire Bill Gates pays Homer and Marge an unexpected visit. Weary of competition, he decides to buy out Homer’s Internet company. But instead of producing a check, Gates instructs two vicious nerds to demolish Homer’s office. Meanwhile, the children try Milhouse for his crime in a mock courtroom, where Bart finds his friend not guilty. Angered by the verdict, Nelson and the others chase Bart, Lisa and Milhouse into a cave. Suddenly, Nelson calls out, having spotted the ‘monster’ Milhouse described earlier. Screaming children rush out of the cave as a wild boar charges them. Hunger wins out in the end, however, and the children consume the animal. A narrator assures viewers the children were eventually rescued from the island.