Season Five begins with Ivar the Boneless asserting... his leadership over the Great Heathen Arm 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 move 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.