On a distant space station far in the future, the best fighters from every planet vie for the championship in an intergalactic fighting competition. After over fifty years of no human contenders, Steve Armstrong emerges having trained all his life for a shot at the title, only to come up against a ruthless extra-terrestrial crime lord who wants him dead.

After the death of Emperor Marcus Aurelius, his devious son takes power and demotes Maximus, one of Rome's most capable generals who Marcus preferred. Eventually, Maximus is forced to become a gladiator and battle to the death against other men for the amusement of paying audiences.