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.

Scott Adkins

Yuri Boyka

Mykel Shannon Jenkins

Turbo

Mark Ivanir

Gaga

Hristo Shopov

Warden Kuss

Marko Zaror

Raul 'Dolor' Quinones

Michael Baral

Casino Manager

Ilram Choi

The Asian Fighter

Robert Costanzo

Farnatti

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