THE UNNAMABLE - OFFICIAL TRAILER - 1988

In the late 18th century, in the Winthrop house, something within it is screaming and banging at the walls of its confines. Joshua Winthrop, the owner of the house, rushes through the poorly lit corridors of the house before unlocking a heavily locked door. He begins talking to the creature inside to calm her down but she then kills him.

Randolph Carter regales two of his university buddies, Howard and Joel, with ghost stories. Randolph points out that they are sitting in the graveyard surrounding the haunted house of his tales (which happens to be within the limits of observation). The story that Randolph had been telling them was of Joshua Winthrop and his demon daughter, Alyda Winthrop. Joel comes up with the idea to stay there overnight. Randolph and Howard go back to the university, leaving Joel alone in the house.

Soon a group of students decide to go there, two young lads fresh from the university football team, Bruce Weeks and John Babcock, and a couple of girls that they want to score with: one of which Howard is in love with, Wendy Barnes. The other, Tanya Heller, is "in love" with Howard. They go there and get set up in a room to tell each other ghost stories. Meanwhile, Howard chases after Randolph to tell him that Joel never came back from the house, prompting Randolph to swing into action saying "I'll get the flashlights" with some degree of authority and urgency, despite not being too bothered about the missing student prior to that.

Alyda Winthrop, the creature, begins stalking the four, planning to kill them as she killed her father and Joel. Soon Joel's decapitated corpse is found hanging upside down, his blood dripping onto a plate of some sort, along with his head, that rolls across the floor to look at a half naked Wendy. Soon Randolph and Howard arrive at the house and Randolph discovers that the door has locked of its own accord upon their entry, which he thinks to be magic. Howard runs off to the aid of Wendy and Tanya, while Randolph decides to study The Necronomicon. In it he finds a spell to unlock the door. He goes outside and enters the ground under a tree via the tomb of Joshua Winthrop. This tree, with the aid of Randolph and the book, snatches Alyda from the house in the climax of the film, leaving Howard and Tanya the only two alive and in the desperately terrifying vicinity of the female demon.

Howard and Tanya flee from the house and run to a safe distance, but a hand comes up from the ground and begins pulling Howard down. It is Randolph coming up from the catacombs beneath having fended off the skeleton guardians.