Returning to Shanghai to marry his fiancée, Chen Zhen (Bruce Lee) a student of renowned martial arts teacher Huo Yuanjia, discovers his sifu has died. During the funeral, members of a local Japanese dojo show up and insult the Chinese students. The bullying continues, with Chen fighting back, but when he discovers the truth - that his teacher was poisoned on the orders of the dojo's master - he sets off on a doomed mission of revenge.