 This film was originally slated to be released in the United States  by 20th Century Fox. However, to convince more exhibitors to install  Cinemascope equipment, studio chief, Darryl F. Zanuck (qv),  pledged that all future 20th Century Fox releases would be in  Cinemascope or a compatible anamorphic process. Since this Hammer  production was shot in standard academy (1.33:1), it had to be  passed over. It was picked up and released through United Artists.