Lucretia, the evil Malic's companion, was played by 'Patricia Medina'. At the time this was filmed, she was married to Joseph Cotten who was playing good guy Captain Craig McKenzie.
This film began as a co-production between Toho and the American television production company Four Star Productions under Don Sharp. After having flown out the American cast to Japan, Sharp declared bankruptcy and pulled out of the contract, leaving Toho to either scrap the film or to produce it with only half the envisioned budget. Toho opted to go ahead and make the film anyway.
After years of being dubbed, Akira Takarada and Akihiko Hirata are heard using their own voices to speak English in this film.
When the television syndication contracts had expired this film became unavailable, reportedly due to a dispute over the rights.