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 father₂s 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.