After the death of his sister, an outstanding martial arts student Lee (Bruce Lee) is recruited by an intelligence agency and then uncovers the evil Han’s (Kien Shih) slavery and drug trafficking ring located on a secret island fortress. Along with martial arts champions Roper (John Saxon) and Williams (Jim Kelly), Lee infiltrates the stronghold and enters Han’s brutal tournament. Lee and his partners fuse skills in Karate, Judo, Tae Kwon Do, T’ai chi ch’uan and Hapkido, in a now classic fight-to-the-death epic battle, all staged by Lee himself.