Brandon, a respected street fighter, is forced to flee the city after his brother is murdered and the money that was supposed to be paid back to a local gangster is stolen. While lying low at his father's house in a small Southern town, Brandon soon gets involved in the local underground cage-fighting circuit. With the help of Drake Colby, a former MMA champion, Brandon devises a scheme to bring a massive payday, if they are able to survive.

Prisoners are dying at the Ogden Correctional Institution, a prison where a corrupt Warden has taken justice and business into his own hands. In the bowels of this prison, an underground fighting society has been formed. The Circuit is flourishing until investigative reporter Nicole Kent is thrown into the mix, and into Pike's cell where she is viciously attacked and left for dead. Enter Dirk Longstreet. Dirk, who was once a fighting champion on the Eastern seaboard circuit, now has to sit idly by as his girlfriend fights for her life. Dirk decides to fight for revenge.

From the cage to the big screen, the world's greatest Mixed Martial Arts Champions come together for the first time in a major motion picture. When an MMA world champion is lured into the illegal world of underground cage fighting by an elusive promoter, he quickly realizes that the only way out is to kill or to be killed. In a place where some fight for glory and some fight for the fight; he will fight for his life. Now, in his greatest effort to come out on top, he can never look back; never show weakness, never leave...and NEVER SURRENDER.

In Los Angeles, an ex-con takes the underground fighting world by storm in his quest to fulfill a promise to a dead friend.

Shawn MacArthur, the kindhearted son of an Alabama wrestling coach, makes a grim living selling fake products on the streets in New York. After dealing with thieving punks, he's discovered by bare-knuckle street-fight manager Harvey Boarden. He soon proves himself worthy and starts earning a small fortune, part of which he volunteers to spend on single mother Zulay Velez. Shawn doesn't cheat, and just that seems a major problem, notably after the arrival of his Alabama high-school rival.