前少年拳击ABA冠军吉米·麦凯布，自母亲离世后，经济拮据，居处被强制搬迁。万般无奈之下，他转向少年时的联合街拳击俱乐部，寻求比尔和埃迪的帮助，与此同时，与掮客乔商议，重拾地下黑拳。黑拳爱好者认为吉米只是前来送死的肉鸡，他甘心冒生命危险，因为他试图站得更高，想在世界上重新获得一席之地勇者无惧，智者无忧，仁者无敌。...

　　The married owners of a struggling functional fitness gym recruit the best athletes to compete in the Games for the huge cash prize. But a figure from the past with a secret threatens to destroy the...