When a narcotics deal goes sour and a suspect disappears, leaving only his clothes, Tokyo police question his wife and stake out the nightclub where she works. His disappearance stumps the police - until a young scientist appears who claims that H-Bomb tests in the Pacific, evidenced by a 'ghost ship' that has turned up in the harbor, have created radioactive creatures - 'H-Men' - who ooze like slime and dissolve anyone they touch.