A gritty MMA fighter is forced into a twisted, underground gambling ring in which he must fight to the death with other MMA fighters in order to save his wife from certain death at the hands of a maniacal crime boss. In a desperate race against time, he is forced into a series of increasingly violent life and death matches while simultaneously piecing together the puzzle which leads him to uncover
U.S. soldier Frank Dux has come to Hong Kong to be accepted into the Kumite, a highly secret and extremely violent martial arts competition. While trying to gain access into the underground world of clandestine fighters, he also has to avoid military officers who consider him to be AWOL. After enduring a difficult training and beginning a romance with journalist Janice Kent, Frank is given the opportunity to fight. But can he survive?
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.
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.
A young fighter named Kham must go to Australia to retrieve his stolen elephant. With the help of a Thai-born Australian detective, Kham must take on all comers, including a gang led by an evil woman and her two deadly bodyguards.
When the head of a statue sacred to a village is stolen, a young martial artist goes to the big city and finds himself taking on the underworld to retrieve it.
Sent into a drunken tailspin when his entire unit is killed by a gang of thrill-seeking punks, disgraced Hong Kong police inspector Wing needs help from his new rookie partner, with a troubled past of his own, to climb out of the bottle and track down the gang and its ruthless leader.