Sakata. Having witnessed the carnage, Inspector Tominaga and others devised a plan to use a high voltage discharge unit to stop the H-Men's infiltration upstream by lighting Tokyo's sewer system on fire. Meanwhile, Uchida has kidnapped Arai and taken her into the sewers to retrieve the stash of drugs. Masada finds a piece of Arai's clothing floating in the water and rushes into the sewers to rescue her. Uchida is killed by an H-Man, and Arai is rescued by Masada. Both gets out of the sewer in time as the flames burn all the H-Men, ending their reign of terror. Cast Akihiko Hirata as Inspector Tominaga Kenji Sahara as Dr. Masada Yumi Shirakawa as Chikako Arai Makoto Satō as Uchida Korenari Senda as Dr. Maki Yōsuke Natsuki Eitaro Ozawa as Inspector Miyashita Hisaya Itō as Misaki Production Writing The idea for The H-Man came from actor Hideo Unagami, who when acting in The Mysterians in 1957 wrote a story proposal called The Liquid Man Appears (液体人間現る, Ekitai Ningen Genru), about a liquid human created by the radiation from the hydrogen bomb. Producer Tomoyuki Tanaka read Unagami's story and he and Toho greenlit a script, but Unagami tragically died from a heart attack in November 1957. After Hideo Unagami died, Takeshi Kimura was hired to adapt Unagami's story into a screenplay, while Ishiro Honda was chosen as the director. Written in November 1957, this first draft titled The Liquid Men (液体人間, Ekitai Ningen), had the basic elements of the story which would remain intact. In Kimura's initial draft, the film's climax had the authorities plan to destroy the liquid monsters by electrifying a part of the Sumida River where the creatures live. When the plan fails, Kenji Sahara's heroic character Masuda volunteers to turn himself into one of the liquid men as a means of better understanding and defeating the enemy. But out of love, instead Chikako Arai sacrifices herself and is transformed into a liquid human and Masada is able to discover that the creatures are living in the sewers within the city where they could be eventually destroyed. There was no fiery climax as in the finished film. The movie was originally envisioned as being in black and white, but after the success of Rodan (1956) in color it was decided to film the movie in color as well. Takeshi Kimura wrote three more script drafts and changed the