Trivia

Elmos Kallman (played by Olivier Mathot) is reading the novel "Une femme au nom d'étoile", by Jules Roy, in the hardback edition of Grasset, 1968, in the collection collection Les chevaux du soleil. The content of the novel is not pertinent to the movie story, but the title is, as a woman named Alpha is central to the plot.

Previously available only in a shortened French version or as a censor-fogged Japanese bootleg, it was virtually impossible to watch it in its complete and uncut form until Severin Films released it on Blu-Ray and DVD in 2020.

In Italy, the film titled was changed in the wake of similar exploitative titles: Giochi erotici di una famiglia per bene (1975) and MitGift (1976).

Filmed back-to-back with Midnight Party (1976), in ten days, sharing most of the cast and crew.

An Italian online source places this movie in the Nazi exploitation sub-genre: A woman who was tortured by the Nazis, and gone mad, thirty years later hypnotizes a beautiful girl and has her kill men and women after they have been in bed with her. Alpha controls Cynthia by telepathy, not hypnotism, and the process used for the killings is not a natural one, hence the extraterrestrial explanation by all other review sources.