Knockout is an American sports drama film that centers around Dan Barnes, a former professional boxer. Dan is retired from the sport after growing tired of living such a violent lifestyle. Searching for inner peace and determined to start a new life, Dan is now working as a janitor at a school where he meets the new kid in town, young Matthew Miller.
Matt has become the target of the school bullies. The ring leader of the group of bullies is the reigning boxing champ at the school, so Matt is determined to learn how to fight. Dan decides to help Matt, and takes the boy under his wing to teach him how not only to stand up for himself against his tormentors, but also to teach him the ways of boxing. Dan discovers that through helping his young protégé, he can finally find peace and comes to terms with his past.