Although King Cat was one of Chang I's earliest films, the young actor was already showing the promise that would make him the star of countless Shaw Brothers' martial arts movies. Chang plays Chan Chao, a knight of justice, who thwarts the plans of Minister Peng to assassinate the revered Judge Pao Cheng over and over again. Lo Lieh gives Chang a good run for his money as the evil and sinister henchman of Minister Peng.

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