Stan's Uncle Jimbo and his Vietnam War buddy Ned take Stan, Kenny, Kyle, and Cartman on a hunting trip in the mountains. As they arrive, Jimbo explains to the boys how to hunt. Whenever they see a creature, they shoot it after yelling, "It's coming right for us!", so they can claim the shooting was in self-defense. Stan does not have the proper temperament to enjoy hunting, and finds himself unable to shoot a living target. Unlike Stan, Kenny is able to shoot animals, impressing Jimbo. Meanwhile, South Park geologist Randy discovers that the mountain on which the boys are hunting is a volcano that is about to erupt. He reports his findings to the Mayor, who directs one of her aides to make appropriate decisions about the crisis.