James Hayter (Dr. Harvey) and Stephen Murray (Bill) died only four days apart: on March 27, 1983 and March 31, 1983 respectively.
Prologue: "God hath made man upright, but they have sought out many inventions." Ecclesiates.
The same year, ingenue Barbara Payton also starred in the Hammer film noir, BAD BLONDE.
The Spanish title DEL GENIO DEL MAL translates to OF THE EVIL GENIUS.