In the fourth installment of the fighting franchise, Boyka is shooting for the big leagues when an accidental death in the ring makes him question everything he stands for. When he finds out the wife of the man he accidentally killed is in trouble, Boyka offers to fight in a series of impossible battles to free her from a life of servitude.
| Actor | Role |
|---|---|
 Scott AdkinsYuri Boyka | Yuri Boyka |
 Teodora DuhovnikovaAlma | Alma |
 Alon AboutboulZourab | Zourab |
 Julian VergovSlava | Slava |
 Martyn FordKoshmar | Koshmar |
 Brahim AchabbakheIgor Kazmir | Igor Kazmir |
 Paul ChahidiKiril | Kiril |
| PPetio PetkovDominik | Dominik |
 Valentin GanevWarden | Warden |
| VVlado MihailovPriest | Priest |
 Vladimir KolevKoychev | Koychev |
 Hristo PetkovGuard | Guard |
| BBoris PankinScout #1 | Scout #1 |
 Bashar RahalScout #2 | Scout #2 |
 Emilien De FalcoViktor | Viktor |
 Tim ManOzerov Brother #1 | Ozerov Brother #1 |
 Andy Long NguyenOzerov Brother #2 | Ozerov Brother #2 |
 Hristo PadevTall Soldier | Tall Soldier |
 Yavor BaharovEMT | EMT |
 Plamen VelikovRussian Priest | Russian Priest |
 Slavi SlavovPrison Referee | Prison Referee |
 Ivan KostadinovLarge Fighter | Large Fighter |
| AAtanas MadzharovChurch Choir | Church Choir |
| AAtanaska PopovaChurch Choir | Church Choir |
| GGeorgi PetkovChurch Choir | Church Choir |
| MMihaela SemovaChurch Choir | Church Choir |
 Trayan Milenov-TroyBoris Tarsov | Boris Tarsov |
 Vencislav StojanovClub Referee | Club Referee |
 Velizar PeevFighter #1 | Fighter #1 |
 Tsvetolyub IlievOpponent | Opponent |