Night of the Demons also known as Halloween Party is a 1988 American supernatural horror film written and produced by Joe Augustyn and directed by Kevin S. Tenney. The film tells the story of ten high school seniors having a Halloween party in an isolated mortuary. Their party turns into a nightmare when after conducting a sance as a party game, they unlock the demon that was locked in the crematorium. Filming of Night of the Demons took place in South Central Los Angeles, California, USA, and lasted for two months.
Judy and her boyfriend Jay pick up their friends, Max and Frannie for the party. Sal Romero, another teen also comes and crashes the party. The house is rumored to be cursed with evil spirits. When Angela holds a sance as a party game, Helen sees a demons face in the mirror, which causes the mirror to shatter. This prompts a demon to come out of the crematorium furnace and possess Suzanne. Helen and Roger want to leave and so are given Angelas car keys.The possessed Suzanne kisses Angela, passing the demon to her. Judy discovers that Jay only invited her to the party to have sex with her. She refuses him and is abandoned by him. Roger and Helen are unable to find an exit. Helen leaves Roger in the car, after which she is killed by a demon. Stooge wanders off to find a bathroom with Suzanne and is irritated when she locks him out. Inside the bathroom Suzanne ages and disappears into a mirror. Confused, Stooge goes to find Angela and is promptly killed by her. The party goers are then picked off one by one by the increasing number of demon possessed people, Jay dies during a sexual encounter with Suzanne and then Max and Frannie are killed by a nowpossessed Stooge. ........
Source: Wikipedia