This was the final film of Kenneth Tobey, John Agar, Gloria Talbott, John Harmon, Robert Shayne, Les Tremayne, Lori Nelson, Jeanne Carmen.
Brinke Stevens returned for additional scenes ten years after the original footage was shot, and the material intercuts seamlessly.
Kenneth Tobey played Col. Patrick Hendry in this film and Capt. Patrick Hendry in the film The Thing from Another World (1951).
Legally, none of the actors can be playing their previous characters. This is a fan-made "film-within-a-film", so the actors are playing themselves doing parodies of their old characters. For example, John Agar and Lori Nelson are playing themselves playing their characters Clete Ferguson and Helen Dobson, which are characters copyrighted and owned by Universal.
This film was shot in 1988, but with reshoots done in 2004.