Frankenstein vs. The Human Vapor (ガス人間第一号対フランケンシュタイン, Furankenshutain tai Gasuningendaiichigō?, lit. Frankenstein vs. Gas Human No. 1) is an unmade 1963 Toho film.
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Toho had always been interested in the Frankenstein character, as years earlier they had planned to film a movie called Frankenstein vs. the Human Vapor as a follow up to their 1960 film, The Human Vapor, that fell by the wayside.