Antrum is a 2018 Canadian horror film written and directed by David Amito and Michael Laicini. The film is divided into two parts: an opening and closing frame narrative in the form of a mockumentary and a feature film. The documentary purports to tell the story of Antrum, a movie released in 1979 that supposedly has deleterious effects on those who watch it similar to the cursed film in Ringu; the bulk of the movie is allegedly the only known print of the film, which has itself been altered by an unknown third party.