Inspired by events in A.D. 60, Boudica follows the eponymous Celtic warrior who rules the Iceni people alongside her husband Prasutagus. When he dies at the hands of Roman soldiers, Boudica’s kingdom is left without a male heir and the Romans seize her land and property. Driven to the edge of madness and determined to avenge her husband’s death, Boudica rallies the various tribes from the region and wages an epic war against the mighty Roman empire.

When the cowardly bureaucrat Catus Decianus breaks a peace treaty with the Iceni by brutalizing and humiliating their queen Boudica and her daughters the Iceian and allies join the queen in a campaign of revenge against the Romans. They plunder Roman cities killing all the inhabitants and burning the cities to the ground until a vastly outnumbered Roman legion faces Boudica's furious hoard.