The tale begins with the vengeful demon Pumpkinhead relentlessly pursuing a fleeing victim, who desperately seeks refuge in a nearby home. Unfortunately for him, the owners refuse to offer sanctuary, unknowingly dooming themselves. From the window of their home, their young son witnesses the horrifying events unfold as Pumpkinhead completes its grim task.
Fast forward several years, the boy, now known as Ed Harley (Lance Henriksen), has grown into an adult with a son of his own. The peace of his life is soon disrupted when a group of six kids from out of town arrives at the Harley store, prompting some local children to recount the chilling tales of Pumpkinhead. Shortly after, calamity strikes when one of the newcomers, Joel (Joel Hoffman), races his dirt bike and tragically collides with Ed’s son. Overwhelmed by panic and the influence of alcohol, Joel flees the scene, leaving the young boy to succumb to his injuries.
Consumed by grief and fueled by a desire for vengeance, Ed seeks out an old witch rumored to have the power to summon Pumpkinhead, awakening the demon from its dark slumber.
In a parallel thread of chaos, Joel's friends, concerned for the injured boy, attempt to get help. However, in a state of blind panic, Joel takes them hostage to cover up his actions. One girl, Maggie (Cynthia Bain), panics and tries to escape, causing chaos as Joel's younger brother Steve (played by John D'Aquino) tries to prevent her flight. In a terrifying moment, Pumpkinhead emerges from the shadows of the trees, brutalizing Steve before hanging his bloody remains at the cabin’s door. As Maggie screams in horror, the demon snatches her away, and amidst this horrifying spree, another girl is murdered, her lifeless body being gruesomely dropped onto a boulder.
Left to fend for themselves against a terror that preys upon those who offer assistance, the remaining trio of survivors find themselves isolated, aware that anyone who interferes becomes a target of Pumpkinhead. Concurrently, Ed is mentally entwined with the demon, sharing a painful connection that allows him to witness the murders unfold in real time, deepening his despair.
Determined to confront the nightmare, Ed teams up with the remaining survivors. Armed and desperate, they encounter Pumpkinhead once again, and after unloading their firearms, they mistakenly believe they've killed it. However, Joel’s bravado ends tragically when Pumpkinhead retaliates, driving Joel's rifle through his chest in a grotesque display of power.
As the terror escalates, Tracy and Jeff, the last of the group, make a run for safety, eventually finding help from a young hillbilly named Jimmy Joe. The demon relentlessly pursues them, leading to a horrific confrontation at a burnt church, resulting in a severe injury to Jeff. In a desperate attempt to shield the remaining group, Ed ventures into danger, seeking solace in his home with Tracy and Jimmy Joe. But soon, Pumpkinhead infiltrates their sanctuary, leading to a chaotic escape where Ed gets impaled by a pitchfork.
In his moment of realization, Ed understands that he can end the carnage by sacrificing himself. However, his attempt leads to a failed outcome, culminating in Tracy firing a shot that ultimately destroys Pumpkinhead, incinerating the beast in a fiery climax.
The story concludes hauntingly, with the witch burying Ed's lifeless body in the grave of Pumpkinhead, sealing his fate as the next in line to become the vengeful demon.
