In an underground fight club, blackbelt Travis Brickley is killed after losing to the evil martial arts master Brakus. Travis' death is witnessed by Walter Grady, the son of his best friend Alex Grady. Alex and his partner, Tommy Lee, vow to avenge their friend's death by defeating Brakus and shutting down the fight club. The Colosseum is the fighting arena owned by the champion Bracus. Now after the death of their friend, Tommy Lee and Alex Grady want revenge.