The original plot involves Lee playing the role of Hai Tien (海天), a retired champion martial artist who is confronted by Korean underworld gangs. They tell him the story of a pagoda where guns are prohibited, and under heavy guard by highly skilled martial artists who are protecting something (which is not identified at all in any surviving material) held on its top level. The gang boss wants Hai to be a part of a group whose purpose is to retrieve said item. They would be the second group to try to do so as the first attempt with a previous group had failed. When Hai refuses, his younger sister and brother are kidnapped, forcing him to participate. Hai, as well as four other martial artists (two of whom were played by James Tien and Chieh Yuan), then fight their way up a five-level pagoda, encountering a different challenge on each floor. The setting of the pagoda was at Beopjusa temple in Songnisan National Park in South Korea.