Possession

Possession is a horror film that follows the story of a couple, Anna and Mark, who are going through a divorce. Anna's behavior becomes increasingly erratic, and Mark discovers that she has been keeping a second flat in a derelict apartment building. When he investigates, he finds a bizarre tentacled creature in the bathroom, and events quickly spiral out of control. The film explores themes of psychological trauma, doppelgangers, and the breakdown of relationships. Despite being referred to as a psychological drama and psychological horror, the genre of the film is still a matter of controversy.

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Some movies that have similar genres and were produced around the same time as Possession include A Nightmare on Elm Street, Shock, Poltergeist, Demons, Rawhead Rex, Demons 2.