The special eye effects for Steve March were created by having John Agar wear special black contact lenses that were very thick. The extreme thickness of the contact made it painful for Agar to wear them.
Vol promises to defeat Gor, saying, "I have powers that equal and surpass the powers of Gor." But when it's time to put up or shut up, Vol stays out of it; his only "help" amounts to telling Sally to wait until Gor materializes and then hit him over the head.
Director Nathan Juran insisted on being billed as "Nathan Hertz" (Hertz was Juran's middle name), apparently because he was embarrassed by this film's low budget and poor quality.
Although some sources list Morris Ankrum as being in the cast, he does not appear in the film.
Brief clips from this movie are used in the opening credits on the sitcom Malcolm in the Middle