Chapman is an ex-marine in Brazil’s slums, battling the yakuza outfit who attacked his sister and left her for dead.

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 Bangkok, the young Kham was raised by his father in the jungle with elephants as members of their family. When his old elephant and the baby Kern are stolen by criminals, Kham finds that the animals were sent to Sidney. He travels to Australia, where he locates the baby elephant in a restaurant owned by the evil Madame Rose, the leader of an international Thai mafia. With the support of the efficient Thai sergeant Mark, who was involved in a conspiracy, Kham fights to rescue the animal from the mobsters.