Screenwriter Arthur C. Pierce appears briefly as one of the mutants escaping from the jail cell in the underground citadel.
The "X-80" is played by a Convair F-102 Delta Dagger, first introduced into service in 1956.
The was shot at the same time as Edgar G. Ulmer's The Amazing Transparent Man. The combined shooting time for the double feature was only two weeks. This film was also meant to cash in the popularity of George Pal's The Time Machine.