Boyka, a former prison fighter, has lost his edge due to a severe knee injury and is now relegated to cleaning toilets. However, when a new international prison fight tournament is announced, offering freedom to the winner, Boyka sees an opportunity to reclaim his dignity and prove himself among the world's top prison fighters.

Undisputed III: Redemption
In the first-ever inter-prison tournament, Boyka, a renowned underground fighter, stages a comeback despite a severe knee injury, facing new challenges as he adapts to fighting in a unique setting.