Jimbo takes the boys on a hunting trip on a mountain. Stan's father, a geologist, discovers that the mountain is going to erupt. The whole town pulls together to save the hunters and South Park itself. Meanwhile, the party on the mountain is unaware of the danger. Their greatest concern is Scuzzlebutt, a monster with celery for a hand, Patrick Duffy for a leg, and spends his free time weaving baskets.