In the year 43 AD, the Roman Army returns to conquer the untamed lands of Britannia, led by General Aulus Plautius and his second-in-command, Lucius. Determined to succeed where Julius Caesar failed, Aulus uses brutal tactics and enlists the help of the mystical Druids to crush the Celtic resistance. Young Cait, a survivor of a Roman attack, finds an unlikely protector in Divis, a mad Druid with apocalyptic visions. Meanwhile, Kerra, a princess of the Cantii tribe, defies her father's wishes and takes matters into her own hands to protect her people from the Roman threat. As alliances are formed and broken between Romans and Britons, an epic battle looms that will decide the fate of Britannia forever.

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Some TV shows that have similar genres and were produced around the same time as Britannia include Fallout, 3 Body Problem, The Last of Us, The Walking Dead: Daryl Dixon, Doctor Who, Person of Interest.