In 1936 Berlin, fourteen-year-old Karl Stern, considered Jewish despite a non-religious upbringing, learns to box from the legendary Max Schmeling while struggling with the realities of the Holocaust.
Sixteen-year-old Gravity Delgado has been breaking records and competitors since she started boxing with a legendary coach at age twelve, and now will reach the Olympics if her home life and romance do not distract her.
Don Apolinar urges Jimmy, who lives in a small Caribbean town where there is not much to do, to start training at the boxing gym and to read about Muhammad Ali. Jimmy begins to realize that he is a good boxer and finds that he would be happy running the gym and improving his hometown.
Jair has always felt that he has to prove himself, but when Zander, the new kid, beats him in a fight and posts it on YouTube, Jair's humiliation and anger pushes him to make a poor decision.
Seventeen-year-old Abraham is in love, but his girlfriend and the grandmother who raised him are worried about his fighting, and things only get worse when his uncle introduces him to boxing.
After their father dies of boxing injuries, George is determined to prevent his younger brother, who sees boxing as his legacy, from pursuing a career in the sport.