Speakman was a student of and was advised closely by Ed Parker in the making of this film. Ed Parker has been accredited with founding American Kenpo as well as teaching the Tracy Brothers who founded the very successful franchise of Tracy's Kenpo.
The film's taglines included "No gun. No knife. No equal." and "Just try him." and is the only well-known Hollywood depiction of Kenpo techniques on-screen. The hit 1990s song The Power by rap group Snap! is featured extensively in the movie's soundtrack.
When Jeff lost his mother as a young man, he became an outcast and frequently lashed out at his family and society in an attempt to assuage his anger. His father gained the idea from a mutual friend, Kim (played by Mako), to enroll Jeff in a Kenpo school to better manage his rage and feelings.
Jeff greatly benefited from the Kenpo classes as a young man, but when a loud-mouth football player slapped his younger brother Adam, Jeff badly injured the football player and almost killed him. In his disgust at Jeff's inability to keep his anger and skills under control, Jeff's father threw him out of the house.
Jeff, now estranged from his family and living alone, continued with his courses in Kenpo and eventually gained Kim as a mentor and father figure.
Years later (as the movie begins) Jeff decides to return to his old neighborhood and visit his mentor Kim. It becomes clear quite quickly that Kim is having trouble with local mafia families, due to his refusal to pay them off and use his antique store to peddle drugs. Jeff tries to help out Kim, but only ends up doing more harm than good to Kim's reputation with the mafia, and this ultimately ends up having Kim murdered by an anonymous hit-man.
Jeff vows to avenge Kim's death, and uses all his resources and fighting skills to go against the mafia and find out who ordered Kim's murder.