In the final episode, the Roman Army turns its attention to Britain, an island of rich resources, powerful tribes and druids, and advanced military equipment. We tell the story of the Celts last stand against the Roman Army, a revolt led by another great leader, the warrior Queen... Boudicca.

In episode two, we discover the Golden Age of the La Tene Celtic warrior and whose world extended as far as Central Turkey. But by the middle of the first Century BC the Celts came up against the Roman Empire, and the Gallic warrior Vercingetorix would challenge Julius Caesar in an epic battle.

Hosts Alice Roberts and Neil Oliver locate the origins of the Celts in the Alps of Central Europe, and relive the moment of first contact with the Romans in a pitched battle just north of Rome - a battle that the Celts won and devastated the city.