It is 47AD. The new emperor Claudius is considered by many to be the village idiot. He can only hang onto his throne by waging a spectacular conquest. He chooses Britannia, a legendary land, which fascinates and inspires fear in the Romans.

Proud and warlike, the Britons use the island's treacherous terrain and dark forests to lure the legions to ruin. Led by magic wielding Druid priests and a charismatic warrior named Caratacus, the Britons resist in the face of the greatest military machine the world has ever known.