Blood Tide is a 1982 British horror film directed by Richard Jefferies, and starring James Earl Jones, José Ferrer, Lila Kedrova, Lydia Cornell, Mary Louise Weller, Martin Kove, and Deborah Shelton. Its plot follows a young American couple visiting a Greek island where the husband's sister disappeared; they soon find that an ancient monster has been released, forcing the villagers to return to the practice of human sacrifice to appease it.