Trivia

Although filmed in 1974, the movie wasn't released until 1981 to cash in on Chuck Norris' popularity.

The film was originally meant for Bruce Lee to be a star in the film but ultimately replaced by Don Wong after Bruce's death in 1973.

Chuck Norris' first starring role.

This is the second and last movie in date that Chuck Norris plays the main antagonist, the previous movie was The Way of the Dragon (1972) opposite Bruce Lee. Unlike the same movie, Chuck Norris survives and is arrested by the police after being defeated by Don Wong.

Despite being filmed in the USA, every actor (including the American ones) was dubbed. This was common practice with Golden Harvest films as an assist to its Chinese actors who were not obligated to speak English.