One year after the events of "Kickboxer: Vengeance", Kurt Sloan has vowed never to return to Thailand. However, while gearing up for a MMA title shot, he finds himself sedated and forced back into Thailand, this time in prison. He is there because the ones responsible want him to face a 6'8" 400 lbs. beast named Mongkut and in return for the fight, Kurt will get two million dollars and his freedom back. Kurt at first refuses, in which a bounty is placed on his head as a way to force him to face Mongkut. Kurt soon learns he will have no other choice and will undergo his most rigorous training yet under some unexpected mentors in order to face Mongkut in hopes to regain his freedom.

Alain Lefevre is a boxer paid by a Marseille mobster to take a dive. When he wins the fight he attempts to flee to America with the mobster's girlfriend Katrina. This plan fails and he seeks escape by joining the foreign legion. As part of the legion he tangles with abusive lieutenant Steinkampf and bonds with legionnaires Luther, Mackintosh and Rosetti.

Alain Moreau's investigation into the death of his identical twin brother leads him from the beauty of the south of France to the mean streets of New York City and into the arms of his brother's beautiful girlfriend. Pursued by ruthless Russian mobsters and renegade FBI agents, the duo race against time to solve his brother's murder and expose an international conspiracy.

Spencer and Bru break into his HQ and capture notorious drug lord Manuel Santiago of a DEA Agent. Santiago's angered assistant, Mason Lee, takes the school hostage where Kelly is teaching and Jessica is one of the students in attendance in retaliation to Santiago's capture. Alison, knowing a way in, joins Spencer and Bru in the rescue.

David Sloan must travel to Mexico to save his wife from a savage international terrorist.

An American soldier who had been killed during the Vietnam War is revived 25 years later by the military as a semi-android, UniSols, a high-tech soldier of the future. After the failure of the initiative to erase all the soldier's memories, he begins to experience flashbacks that are forcing him to recall his past.

Jean Claude Van Damme plays a dual role as Alex and Chad, twins separated at the death of their parents. Chad is raised by a family retainer in Paris, Alex becomes a petty crook in Hong Kong. Seeing a picture of Alex, Chad rejoins him and convinces him that his rival in Hong Kong is also the man who killed their parents. Alex is suspicious of Chad, especially when it comes to his girlfriend.

Jean Claude Van Damme plays a dual role as Alex and Chad, twins separated at the death of their parents. Chad is raised by a family retainer in Paris, Alex becomes a petty crook in Hong Kong. Seeing a picture of Alex, Chad rejoins him and convinces him that his rival in Hong Kong is also the man who killed their parents. Alex is suspicious of Chad, especially when it comes to his girlfriend.

The Canadian policeman Louis Burke is assigned in a jail to investigate the murders of prisoners and jailors. When in jail, Louis, using his outstandings martial arts skills, is able to save his life and make himself respected in that violent world. At least, helped by two another prisoners, he succeded in finding the truth about the dreadful crimes. In a violent and corrupt prison, decorated cop Louis Burke must infiltrate the jail to find answers to a number of inside murders. What he finds is a struggle of life and death tied in to his own past.

Lyon Gaultier is a deserter in the Foreign Legion arriving in the USA entirely hard up. He finds his brother between life and death and his sister-in-law without the money needed to heal her husband and to maintain her child. To earn the money needed, Gaultier decides to take part in some very dangerous clandestine fights.