Russian inmate Boyka (Scott Adkins), now severely hobbled by the knee injury he suffered at the end of "Undisputed 2", is no longer the feared prison fighter he was. Indeed, he has fallen 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 and enticing them with the promise of freedom for the winner - Boyka must rediscover his dignity and fight for his position in the tournament...
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