Although some sources list Morris Ankrum as being in the cast, he does not appear in the film.
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.
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.