Reigon was the fourth and final unmade film in a series of concepts Nikkatsu Company had before making Gappa. Reigon got the furthest into the development out of the four scrapped projects, receiving a plot synopsis, speculative screenplay, and kaiju ideas. Planning was done by Hideo Kodama, the draft was written by Shun'ichi Yukimuro and Ryuzo Nakanishi.
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