Company commander Claus Michael Pedersen and his men are stationed in Helmand, Afghanistan. Meanwhile back in Denmark, with a husband at war and three children missing their father, everyday life is a struggle for Claus' wife Maria. During a routine mission, the soldiers are caught in heavy Taliban crossfire. In order to save his men, Claus makes a decision that ultimately sees him return to Denmark accused of a war crime.

The final season finds Bjorn now the king of Kattegat, while Ivar is a fugitive in Russia and Lagertha plans a peaceful retirement to a country farm.

Season five begins with Ivar the Boneless asserting his leadership over the Great Heathen Army, while Lagertha reigns as Queen of Kattegat. Ivar’s murder of his brother Sigurd sets the stage for vicious battles to come as Ragnar’s sons plot their next moves after avenging their father’s death. Bjorn follows his destiny into the Mediterranean Sea and Floki who is suffering from the loss of his wife Helga, takes to the seas submitting himself to the will of the Gods. This season is full of startling alliances and unbelievable betrayals as the Vikings fight to rule the world.