Warrior follows two estranged brothers, Tommy and Brendan Conlon, who independently enter a mixed martial arts tournament called Sparta with drastically different motivations. Tommy, a haunted war veteran, seeks prize money while concealing a painful secret, while Brendan, a struggling schoolteacher, fights to save his family's home. Their paths inevitably collide in the championship bout, forcing them to confront a broken past and the bonds of brotherhood.
Gavin O'Connor films two MMA-fighting brothers reconciling in the cage. The film is the genre's most operatic; the sport is the family therapy.