The first ten episodes from the fourth season of the historical drama following the adventures of a Viking clan. The season follows Ragnar (Travis Fimmel), a Viking chieftain who, along with his brother Rollo (Clive Standen) and wife Lagertha (Katheryn Winnick), plots to become king. A formidable warrior, Ragnar often leads his men on raids overseas.However, even as he makes a name for himself on the battlefield, Ragnar must be aware of rivals plotting behind his back in his homeland. The episodes are: 'A Good Treason', 'Kill the Queen', 'Mercy', 'Yol', 'Promised', 'What Might Have Been', 'The Profit and the Loss', 'Portage', 'Death All Round' and 'The Last Ship'.