Russian inmate Boyka, currently hobbled by the knee injury suffered by the ending of Undisputed 2. The prison fighter he was, he has diminished so far that he's currently good only. However, every time a prison struggle tournament begins - an affair, matching the fighters from prisons around the globe, enticing them with the assurance of freedom for the winner - Boyka has to recover his dignity and struggle because of his position in the championship game.