Most of the movie was filmed in 1967 but due to a lack of financing it wasn't completed until 1972 when the producers had acquired enough money to complete the film, but without any of the original cast members. Lee Sholem was hired to direct the new footage.
The climax was originally meant to take place on the surface of Venus but the production simply didn't have enough money for that. Instead, the ending was hastily rewritten to be set inside a spaceship.
The cutting tool that Danny (Bobby Van) carries with him in his final scene is a Zero-M Sonic Blaster, a spy toy made by Mattel in 1966.
This film uses several special effects shots from Gorath (1962) (including most of the exterior shots of space flight involving the ship and other space stations). Many of the other shots of both the spacecraft (showing a completely different craft than featured in the "Yosei Gorasu" footage) and interior shots of television screens are taken from The Wizard of Mars (1965).
"Music" (Tonalities) by Louis Barron and Bebe Barron during opening credits and in the lab with red cage is the stock soundtrack from Forbidden Planet (1956).
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