母親の転職で、アメリカから北京に引っ越して来た11歳のドレ（ジェイデン・スミス）は、言葉や文化がまるで異なる環境の違いから、いじめに遭ってしまう。そんなある日、ドレはカンフーの達人であるハン（ジャッキー・チェン）に出会い、猛特訓を開始。抜群の精神力を秘めていたドレは、見違えるように強い少年へ成長していくのだが……。

The Oscar nominated actor best known for his role of Mr. Miyagi, left behind a painfully revealing autobiographical record of his much-too-brief time here on earth. Tracing his journey from being bed bound as a boy to the bright lights and discrimination in Hollywood. Deep inside that sweet, generous, multi-talented performer seethed an army of demons, that even alcohol and drugs couldn't mask.

The Karate Man honors his recently deceased Sensei through a tribute video he created dedicated to his Sensei's legacy.