Demons 2 (1986)

Watch Demons 2: A documentary is shown on TV of group of teens who investigate the legendary forbidden zone, in which a Demon infestation once took place (see Demoni I). When finding a lifeless corpse of a demon, one of the teens causes the resurrection of it, and the demon makes it's way into the nearby world by TV-broadcast... An unlucky girl, having her birthday-party at that time, gets possessed by the demon while watching the documentary and soon the entire building in which she lives turns into a living nightmare....