The Human Vapor is a 1960 Japanese Toho Studios science fiction thriller film. It features Tatsuya Mihashi, Kaoru Yachigusa, Yoshio Tsuchiya, and Keiko Sata.
A librarian is subject to a scientific experiment which goes wrong and transforms him into ‘The Human Vapour’. He uses his new ability to rob banks to fund the career of his girlfriend, a beautiful dancer. The Human Vapour is ruthless in his quest for money and kills anyone who stands in his way, especially police. He soon becomes Tokyo’s most wanted criminal. Can he be stopped before he kills again?
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The Human Vapor is part of the 'Transforming Human' series, which is a trilogy of science-fiction films produced by Toho Studios from 1958 to 1960. It includes the films The H-Man, The Secret of the Telegian and The Human Vapor. All three films revolve around 'kaijin', human-like 'kaiju', that were spawned by some sort of scientific experiment.