Incubus

“Evil has never been so seductive.”

Nobody on this island speaks anything but Esperanto, and the demons and spirits who live there are working on a man named Marc (William Shatner). Leslie Stevens made the film entirely in the constructed language, with Conrad Hall behind the camera and Allyson Ames as Kia, one of the figures Marc meets there. Shatner stands among the island's demons and spirits, a man alone against the forces of evil.