KOTC: Unification (2012)

Russian inmate Boyka, now severely hobbled by the knee injury suffered at the end of Undisputed 2. No longer the feared prison fighter he was, he has declined so far that he is now good only for cleaning toilets. But when a new prison fight tournament begins - an international affair, matching the best fighters from prisons around the globe, enticing them with the promise of freedom for the winner - Boyka must reclaim his dignity and fight for his position in the tournament.

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

Picking up after the events of Never Back Down 2, former MMA champion Case Walker is on the comeback trail to become champion once again.

Every seven years, in an unsuspecting town, The Tournament takes place. A battle royale between 30 of the world's deadliest assassins. The last man standing receives the $10,000,000 cash prize and the title of World's No. 1 Assassin, which itself carries the legendary million dollar-a-bullet price tag.

Jake, full of anger after his father's death, is just starting to find a place for himself at his new Orlando high school - until Ryan, head of an underground MMA fight club, picks Jake out as a prime opponent. After being trounced by Ryan in front of the entire school, Jake begins training under the firm, moral guidance of a MMA master, where he learns how to fight... and how to avoid a fight. But it becomes obvious that a rematch will be inevitable if Jake wants to stop Ryan and his bullying, once and for all.

The youngest son of an alcoholic former boxer returns home, where he's trained by his father for competition in a mixed martial arts tournament – a path that puts the fighter on a collision course with his estranged, older brother.

A former fighter reluctantly returns to the life she abandoned in order to help her sister survive the sadistic world of illegal fighting and the maniac who runs it.

Raised as a slave, Danny is used to fighting for his survival. In fact, his "master," Bart, thinks of him as a pet and goes as far as leashing him with a collar so they can make money in fight clubs, where Danny is the main contender. When Bart's crew is in a car accident, Danny escapes and meets a blind, kindhearted piano tuner who takes him in and uses music to free the fighter's long-buried heart.

A veteran cop and an unstable detective become partners who must put their differences aside in order to bring down a heroin-smuggling ring run by ex-Special Forces.

Two warring gang families (one African-American, the other Chinese) maneuver for bragging rights to the Oakland, California, docks. Hang Sing and Trish O'Day uncover a trail of deceit that leaves most of the warring factions dead … or worse!