Originally one entity, a normal snowman is made by Calvin who then brings it to life. Unfortunately, the snowman becomes aggressive and monstrous, so it chases Calvin across the yard until Calvin hides inside of the house.
Later, Calvin meets up with Hobbes and they begin throwing snowballs at the snowman, which only stick to him, giving the snowman the idea to pack more snow onto himself and give himself an extra head and arms, thus cementing his transformation into a deranged mutant killer monster snow goon.
The original snow goon then makes another one and the two snow goons continue making other snow goons until they number at about fifteen by nightfall when they all go to sleep. Calvin and Hobbes then sneak out of bed and use the garden hose to freeze, not just the snow goons, but the entire yard, effectively "killing" them.
- The compilation book Attack of the Deranged Mutant Killer Monster Snow Goons is named after the snow goons.