Toho had always been interested in the Frankenstein character as, in 1961, producer Tomoyuki Tanaka commissioned a film project called "Frankenstein vs. the Human Vapor". Acting as a sequel to the 1960 film "The Human Vapor", the Mizuno character from that film finds the Frankenstein Monster's body, and revives him, so that he can help him use the Frankenstein formula to revive his beloved girlfriend Fujichiyo (who had died at the end of said film). As a rough draft of the story was being written by Takeshi Kimura (using the pen name Kaoru Mabuchi), it was ultimately cancelled before the draft was finished.