Freda was angered by the way producers and other filmmakers had his cinematographer Mario Bava work on previous films, specifically films of Pietro Francisci. Freda concocted a way to push Bava into the director's chair of Freda's next film, "Caltiki – The Immortal Monster"; he left the project early. Bava had been hired again as the film's cinematographer, while Filippo Sanjust was hired as the film's screenwriter, having co-written Freda's previous film "Beatrice Cenci" (1956). Freda also contributed to the script without credit.