The bulk of the movie was filmed in The Chiselhurst Caves to enhance the production value, but resetting lights and moving cameras around the natural rock formations proved to be problematic and time consuming.
The script was written in four days because director Norman J. Warren had financial backers and no screenplay. The film was shot in four weeks.
The story was originally supposed to take place aboard a spaceship, but they changed the location to avoid having to employ elaborate special effects.
Stephanie Beacham, then a mother of two young children, accepted the role of Kate Carson to support her family, recalling in a 2003 interview: "I had to choose between a play that I really, really wanted to do, which would have paid me £65 a week, and this script for a film called Inseminoid. Hey! No choice. Two pink babies asleep upstairs! No choice!"
Originally Norman J. Warren wanted orchestral sound, but because of a lack of budget John Scott suggested electronic synthesizers.
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