First of two back-to-back sci-fi/horror films for Barbara Carrera, who appeared in the following year's The Island of Dr. Moreau (1977). Both films were produced by Sandy Howard and included three of the same make-up department personnel.
The movie covered some of the same thematic territory that director Ralph Nelson had previously examined in his earlier film Charly (1968).
Re-released in the US as "Created to Kill".
First of four films in a five-year period in the sci-fi/fantasy/horror genre for Barbara Carrera. The others were Embryo (1976), Condorman (1981), When Time Ran Out... (1980) and The Island of Dr. Moreau (1977).
Joyce Brothers: As herself at a party but portraying a biologist rather than her actual profession as a psychologist.