King of Kung Fu (1973)

A man is jailed unfairly for his debts, so his son (rarely used actor Steve Yu) takes up a job as a traveling medicine salesman and street performer to get him out. During his travels, he is killed in a confrontation with the son of a local kingpin. The son's kung fu school colleagues, along with the grieving sister and love interest, come to town as street performers in order to investigate and/or avenge his death. A local ally of the hero pretends to play both sides of the conflict....