The Beast Must Die is a 1974 British horror film directed by Paul Annett. The screenplay was written by Michael Winder, based on the 1950 short story "There Shall Be No Darkness" by James Blish, originally published in Thrilling Wonder Stories. The film stars Calvin Lockhart, Peter Cushing, Marlene Clark, Charles Gray, Anton Diffring, Ciaran Madden, Tom Chadbon, and Michael Gambon. The plot involves a millionaire big game hunter who gathers six people at his remote English mansion, announcing that he suspects one of them is a werewolf. The viewer is invited to unfold the mystery along with the characters.