is a Japanese science fiction thriller film directed by Ishirō Honda, with special effects by Eiji Tsuburaya. Plot On a rainy night in the outskirts of Tokyo, a drug smuggler, Misaki, is killed while trying to escape in a getaway car, leaving only his clothes behind. The police go to his apartment to investigate, questioning his girlfriend, Arai Chikako, who says Misaki hasn't returned home for five days. Arai is a singer at a cabaret, and meets Masada, a Jyoto University professor, there. She gives him a note to take to Misaki, but is confiscated and taken into custody by the police. He theorizes to the police Misaki's disappearance is the result of his physical form melting away due to exposure to radiation in the rain that night. The police dismisses the theory. That night, Nishiyama of a drug smuggling gang sneaks into Arai's apartment and threatens her, asking her where Misaki is. However, Arai doesn't know, and Nishiyama leaves by the window, followed by gunshots. Arai screams and the police investigates, looking outside Arai's bedroom window and finding only a pile of clothes and a gun on the floor. In the morning, the police take Arai in for questioning, but gets no new information from her. Masada arrives at the police station and invites Inspector Tominaga and Detective Sakata to his medical institute to hear the testimony of a group of fishermen, who allegedly witnessed some of their crew members fall victim to a liquid creature, disintegrating them and leaving their clothes behind. Masada next shows the detectives the test effects of radiation poisoning the fishermen were exposed to on a frog. The frog melts almost immediately, all of its cells transforming into a liquid creature. Arai later visits Masada and his superior, Dr. Maki, at the medical institute and tells him she also witnessed a man (Nishiyama) dissolving, leaving his clothes behind. Dr. Maki dubs this liquid creature the H-Man. They go to the police station again with their findings and Arai's testimony, where she also agrees to lead police to the gang at the cabaret. That night, the police goes to the cabaret and made arrests, but Uchida, one of the gangsters, is tipped off by the gangster waiter and retreats to dancer Emi's room. Once inside, the gangsters try to escape through the window, but the H-Man appears, dissolving the waiter and Emi, and later Detective