Traumatized and suffering from amnesia after witnessing a terrible accident, a man who calls himself P.J. is admitted to a hospital, where psychiatrist Alan Shearson tries to get him on the path to recovery. But Dr. Shearson's boss wants to hand over the patient to the state mental ward, and the man's bitter ex-girlfriend is reluctant to help.
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The mob is trying to strongarm local martial arts schools, forcing young Jason Stillwell and his family to move after his father is injured defending their dojo. With his father now rejecting violence, Jason is forced to train on his own to protect himself and his best friend from the members of a rival karate school.
