Kiril Efremov

Just an ordinary boy from the Sofia suburbs becomes the first bulgarian undercover cop. Forced by his father when he was young to lie and cheat, Martin becomes the perfect liar. That skill, and also the hatred of the 'underworld' makes him the perfect match for a dangerous mission - to infiltrate the crime organisation of a rich and powerful businessman. While infiltrating and living in fear of being uncovered, Martin falls in love with the most inappropriate woman - Djaro's girlfriend, Suni. Just when he gains the trust of the mobsters, it appears that the real enemy is in the police. Martin is alone against all, facing difficult decisions.

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.