Britannia - Season 1

Gen. Aulus Plautius leads an army of Roman invaders into Britannia; the invasion is foreseen by rogue Druid Divis, who finds an unlikely ally in young Celt girl Cait.

King Pellenor is convinced his people can destroy the Romans using force, but Kerra seeks an alternative approach; Cait struggles to connect with Divis and is soon left to fend for herself; an attempted mutiny goes wrong; Aulus finds an ally.

Aulus returns from his visit to the Underworld; Pellenor is furious to learn of Kerra's secret visit to the Romans; Divis persuades two Romans to get him into the enemy camp; Cait reunites with Divis to provoke a change in plans.

Veran leads his troupe of Druids to Crugdunon Fortress to deliver judgement to Kerra; events take an unexpected turn, leading to a new order for the Regni; Cait makes a confession to her father; Aulus punishes the Roman mutineers.

When Kerra is given a deadline to make a decision, Lindon offers her an alternative path; Phelan struggles to come to terms with the recent events, while Amenda spirals down a self-destructive path. Aulus visits Queen Antedia of the Regni.

Divis receives a deadly mission; Kerra adjusts to her new role as vendettas are plotted against her; Cait and her father find peace at Crugdunon, but it is short-lived; Aulus agrees to talk with Kerra but is sidetracked by a personal mission.

Camped out in a deserted village, Phelan is not convinced by Ania's confidence in her prophecy; Cait and Sawyer find solace, but it is cut short when Divis' demon Pwykka tracks them down; Roman deserters contemplate the gods.

The Cantii are still under siege from the Regni; Antedia uses a spy to her advantage; Aulus, sidetracked by a personal mission, tasks three sets of assassins to track down Cait; Lucius' mistrust of Aulus grows and his actions have fatal consequences.

Divis tries to track down the abducted Cait; the siege of the Cantii reaches a bitter and violent end; Phelan and Ania seek answers from Druid Veran, who considers the hope that is left for them in the form of Cait.