Trivia

Written by Virginia-based university writers R.H.W. Dillard, George Garrett and John Rodenbeck, this film was originally conceived as a comedy and a parody of the science fiction and horror genres, but the producers, while they were amused, wanted a serious science fiction/horror film instead. Comedic elements from the film's script that were cut from it included Col. Frank Saunders/Frankenstein being partially made from transplanted human parts, including the legs of a dead tap dancer (and, as a result, whenever he heard the song "Sweet Georgia Brown" he would immediately start to tap dance and not stop, no matter what the situation was).

At approximately 49:00 into the film, several of the Martians are seen carrying hand-held weapons that are actually modified Wham-O Air Blasters, a popular toy in the 1960s.

American actor Bruce Glover plays two uncredited roles in this film, a "Martian Crewmember" and Mull the Space Monster, but Glover is best known for being the father of "Back to the Future" star Crispin Glover, and playing the assassin Mr. Wint in the James Bond film "Diamonds Are Forever".

This film was ranked #7 in the 2004 DVD documentary "The 50 Worst Movies Ever Made".

The film debut of James Karen.