Incubus () is a 1966 American horror film directed by Leslie Stevens. Filmed entirely in the constructed language Esperanto, the film stars William Shatner, shortly before he would begin his work on Star Trek. The film's cinematography was by Conrad Hall, who went on to win three Academy Awards for his work on the films Butch Cassidy and the Sundance Kid, American Beauty, and Road to Perdition. Incubus was the second feature film to use Esperanto, following the 1964 film Angoroj. The use of Esperanto was intended to create an eerie, otherworldly feeling, and Stevens prohibited dubbing the film into other languages; however, on the Special Features section of the DVD the makers claim that Esperanto was used because of perceived greater international sales. Esperanto speakers are generally disappointed by the pronunciation of the language by the cast of Incubus. The film was considered to be lost for many years, until a copy with French subtitles was found at Cinémathèque Française in 1996. Plot The film is set in the village of Nomen Tuum (Latin, "your name"), which has a well that can heal the sick and make a person more beautiful. Because of the latter, many conceited or corrupt individuals come to the village for this cosmetic effect. The village has notoriety for its magical water, as well as being a ground for darkness and demons. Along the village, succubi entice the tainted souls who come to Nomen Tuum and lead them to their deaths in order to offer their souls to Hell/the God of Darkness. A prominent young succubus named Kia (Allyson Ames) loathes the routine of herding sinners to hell. Kia claims her powers are being wasted, and needs something/someone more stimulating as her prey. Her sister succubus, Amael (Eloise Hardt), warns Kia of the danger that a pure soul will bring: love. Kia persists anyway and attempts to find a clergyman to seduce into darkness. After watching their behaviour, however, she realizes these men are just as iniquitous and shrewd as her previous victims. She soon stumbles upon a suitable victim: Marc (Shatner), a young soldier, who with his sister Arndis (Ann Atmar) comes to the sacred water in order to heal his battle wounds. Kia then continues to follow the siblings and pretends to be lost. After a brief eclipse, Kia convinces Marc to accompany her to the sea. During the eclipse, Arndis becomes blind