The Transforming Human Series (変身人間シリーズ Henshin Ningen Shirīzu), also unofficially known as the "Mutant Trilogy," is a trilogy of science-fiction tokusatsu films produced by Toho from 1958 to 1960. It includes the films The H-Man, The Secret of the Telegian and The Human Vapor.[1] All three films revolve around kaijin, human-like kaiju, that were spawned by some sort of scientific experiment. Although the films do not share continuity, they share many similar premises and themes, and two of them, The H-Man and The Human Vapor, share the same director, Ishiro Honda.
Men are being murdered by a psycho called "The Telegian," who uses a matter-transmitting device to locate his victims.
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?
