打黑拳的博尔特没有遵守老板输掉比赛的要求，逃亡到洛杉矶投奔哥哥。随后他遇到了索尼娅，两人的关系发展迅速。但是黑拳老板派人追到洛杉矶，逃跑不成博尔特被要求再次打输比赛，他决定不再逃跑，捍卫自己的人生。

　　foster brother, HENRY, in San Francisco. Henry reluctantly takes him in but finds their old feud is far from extinguished. Then Bolt falls for SONYA