Known as Chikyū Bōeigun (Earth Defense Force) in Japan, The Mysterians is important to our kaiju studies as it contains the first appearance of Moguera, who would one day become M.O.G.U.E.R.A. (Mobile Operation Godzilla Universal Expert Robot Aero-type), who took over the role intended for Mechagodzilla in Godzilla vs. Space Godzilla. While the robot never was in a Godzilla film in the Showa timelime, he would become the big green guy’s only ally in the Heisei films*.
But here, he starts the movie blowing up a village and then gets destroyed by the military before the Mysterians show up, demanding their own land and the right to marry Earth women.
That’s because 10,000 years ago the planet Mysteroid was destroyed by a nuclear war. Once it was the fifth planet from our sun and now it’s nothing, with the Mysterians losing eighty percent of their people and needing to get at least five Earth women to make their race strong again.
Producer Tomoyuki Tanaka recruited Jojiro Okami, an aeronautical engineer and military test pilot who later became a science fiction writer to write the script for director Ishirō Honda.
The story of this movie would continue in 1959’s Battle In Space and 1977’s The War In Space. As for its influence, the band ? and the Mysterians would get their name from this film.
*The original Moguera suit was destroyed by an accidental fire during the filming of The Prophecies of Nostradamus.