Season Five begins with Ivar the Boneless asserting his leadership over the Great Heathen Army, while Lagertha reigns as Queen of Kattegat. Iver'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. --

Season Six returns following the battle between brothers which left Bjorn Ironsides a hero to the people who have been under the tyrannical rule of Ivar for so long. As the new leader of Kattegat, Bjorn struggles to fill his late father's shoes as king, while facing critical dilemmas and wrestling with the idea that power overshadows morals. Meanwhile, Ivar travels to Russia and meets his match in Prince Oleg, a ruthless and unpredictable ruler.

Vikings returns for a gripping fourth season. Season three culminated with the extraordinary battle in Paris, where Ragnar seized victory from the jaws of defeat, but still returns to Kattegat dangerously ill. Thoughts of his death galvanize the forces who seek to succeed him as king, including his wife Queen Aslaug and his oldest son, Bjorn. Meanwhile, Lagertha continues power struggles with her calculating, former second in command, Kalf.

"Ragnar and the Vikings have returned to Kattegat after raiding Paris. While Ragnar recovers from his wounds suffered in Paris, he meets a new slave, Yidu, whom he grows close to. He must also deal with Floki, who has been imprisoned by Bjorn for the murder of Athelstan. Bjorn also reveals to Ragnar that he intends to travel into the wilderness to find himself, but not before Kalf and Erlendur plot against him. Meanwhile, the Viking women have growing...