Thirteen years after the "Lawnmower Killer" killed her sister, high school student Mary Graves and obsessed detective Dick Harbinger are on the lookout for the killer to reappear during the annual Halloween Pumpkin Prom.
Two young children and an adult in a small town have an encounter with an alien spaceship. 25 years later the children are reunited as adults in the same town which is now beset by strange cattle mutilations. Matters become worse when the cattle mutilations are joined by human murders and mutilations.
