Dementia 13 (UK title: The Haunted and the Hunted) is a 1963 horror-thriller released by American International Pictures, starring William Campbell, Patrick Magee, and Luana Anders. The film was written and directed by Francis Ford Coppola and produced by Roger Corman. Although Coppola had been involved in at least two nudie films previously, Dementia 13 served as his first mainstream “legitimate,” directorial effort.

Corman offered Coppola the chance to direct a low-budget horror film in Ireland with funds left over from Corman’s recently completed The Young Racers, on which Coppola had worked as a sound technician. The producer wanted a cheap Psycho copy—complete with gothic atmosphere and brutal killings—and Coppola quickly wrote a screenplay in accordance with Corman’s requirements. Although he was given total directorial freedom during production, Coppola found himself fighting with Corman after the film was completed. The producer declared the movie unreleasable and demanded several changes be made. Corman eventually brought in another director, Jack Hill, to film additional sequences.