Trivia

The first and only film directed by Peter Zinner, who won an Oscar for his editing on El francotirador (1978).

Screenwriter Rod Serling died six years before the film came out, in 1975.

Filmed during the actors' strike of 1980.

One of the two films in which Gitte Lee appeared beside her husband Christopher Lee. The other was Safari 300. In both cases she was uncredited.

John Steiner's voice was dubbed by Larry Dolgin.