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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.

A man must survive a prison where hardened criminals battle to the death for the warden's entertainment.

Canadian policeman Louis Burke is assigned in a jail to investigate the murders of prisoners and jailors. While there, Louis, using his outstanding martial arts skills, is able to save his life and make himself respected in this violent world.

While on a prison furlough, a lowly criminal evades his guards and returns to his old stomping ground to take revenge on the people who turned him into a cold blooded killer.

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 Chicago cop is caught in the middle of a gang war while his own comrades shun him because he wants to take an irresponsible cop down.

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

Ace is an impressionable young man working for a dry cleaning business. His friend, drug dealer Mitch, goes to prison. In an unrelated incident, he finds some cocaine in a pants pocket. Soon, Ace finds himself dealing cocaine for Lulu. Via lucky breaks and solid interpersonal skills, Ace moves to the top of the Harlem drug world. Of course, unfaithful employees and/or rivals conspire to bring about Ace's fall.

After working as a drug courier and getting into a brutal shootout with police, a former boxer finds himself at the mercy of his enemies as they force him to instigate violent acts that turn the prison he resides in into a battleground.

Brazil is a contract killer, willing to take any job if the price is right. Flint left the assassin game when a ruthless drug dealer’s brutal attack left his wife in a coma. When a contract is put out on the same coldblooded drug dealer, both Brazil and Flint want him dead – one for the money, the other for revenge. With crooked Interpol agents and vicious members of the criminal underworld hot on their trail, these two assassins reluctantly join forces to quickly take out their target before they themselves are terminated.

A family man convicted of killing an intruder must cope with life afterward in the violent penal system.

Small-town boy Shawn MacArthur has come to New York City with nothing. Barely earning a living selling counterfeit goods on the streets, his luck changes when scam artist Harvey Boarden sees that he has a natural talent for streetfighting. When Harvey offers Shawn help at making the real cash, the two form an uneasy partnership.

Heavyweight Champ George "Iceman" Chambers is sent to a Russian jail on trumped-up drug charges. In order to win his freedom he must fight against the jailhouse fighting champ Uri Boyka in a battle to the death. This time he is not fighting for a title, he is fighting for his life!

Four fighters from different backgrounds come together to train under an ex MMA rising star and then ultimately have to fight each other and the traitor in their midst.

When a woman's father goes missing, she enlists a local to aid in her search. The pair soon discover that her father has died at the hands of a wealthy sportsman who hunts homeless men as a form of recreation.

An old gangster is advised that Freddie Mays would leave jail after thirty years in prison. His mood changes and he recalls when he was a young punk and who joined Freddie's gang—a man he both envied and ultimately betrayed.

Mason Storm, a 'go it alone' cop, is gunned down at home. The intruders kill his wife, and think they've killed both Mason and his son too. Mason is secretly taken to a hospital where he spends several years in a coma. His son meanwhile is growing up thinking his father is dead. When Mason wakes up, everyone is in danger - himself, his son, his best friend, his nurse - but most of all those who arranged for his death

A young Asian American martial artist is forced to participate in a brutal formal street-fight competition.

Tommy Riley has moved with his dad to Chicago from a 'nice place'. He keeps to himself, goes to school. However, after a street fight, he's noticed and quickly falls into the world of illegal underground boxing — where punches can kill.

A former youth boxing champion, Jimmy McCabe is a man in search of hope but looking in all the wrong places. When he hits rock bottom he turns to his childhood boxing club and the only family he has left: gym owner Bill corner man Eddie and promoter Joe. Back in training, years after anyone thought he was a contender, he risks his life, as he tries to stand tall and regain his place in the world.