Messengers arrive in Kattegat with news that presents Bjorn with a dilemma. As Bjorn attempts to do the right thing as ruler of Kattegat, Prince Oleg of Kiev seems untroubled by his conscience.

Lagertha is forced to take action; In Kiev, although Oleg continues to be friendly, Ivar is aware of the threat which Oleg poses to the vulnerable young heir to the throne; Bjorn has answered the call and come to the aid of an old enemy.

Norway's Kings and Jarls arrive at Harald's territory for the election of the King of all Norway, while King Olaf is confident of the result, the election may not run as smoothly as he thinks.

Bjorn returns to Kattegat; Harald gains a measure of revenge on Olaf; in Kiev, interesting news reaches Ivar and Igor about Prince Dir.

Ubbe and Torvi are able to meet their unknown wanderer while in Iceland; Bjorn reconsiders who his enemies truly are after Erik's scouting mission,which prompts him to convince an old nemesis to join him; Ivar reunites with a close figure.

While Ivar and Igor continue to plot against Oleg, Kings Harald and Bjorn make frantic preparations to defend against the invasion,but the efforts of their quick work remain to be seen.

In Iceland, Ubbe learns the truth about Kjetill and has a difficult decision to make. Back in Norway, the battle against the Rus has had grave consequences. But reinforcements have arrived, and Bjorn has an idea that may yet save the day.

Trouble at sea heightens divisions near Iceland. A homecoming king with a new friend ends the spousal division threatened by an election in Kattegat. Good Friday is an opportunity for division among the Rus.

Prince Igor receives a hero's welcome in Novgorod but back in Kiev the mood is darker: prince Oleg will not be giving up the fight. Ubbe and the settlers find land but not the golden land.

Fighting in Greenland means a change of destination and new dangers for Ubbe and company. A death in Kiev brings changes. Gunnhild makes her choice. Ivar gets a surprise and makes a decision.

Out in the open sea, Ubbe and the settlers are at the mercy of the elements. Meanwhile Ivar and Hvitserk return to Kattegat

When king Alfred hears about the arrival of the sons of Ragnar, with an army he must take drastic action. So as the Vikings army makes camp & lies in wait, Alfred and his army abandon the royal villa and march to meet them.

Ubbe and settlers find land but soon realize they are not alone. In Wessex, king Alfred has mustered up a large force to fight the Vikings. Meanwhile in Kattegat, Erik realizes that Ingrid had been using her powers on him

In the new land, Ubbe and the settlers engage in careful diplomacy when they are surrounded by the locals. In Wessex the Vikings ambush the Saxon army, but Alfred is convinced the lord is with his army and refuses to retreat.

The epic saga which began with Ragnar Lothbrok, the first Vikings leader to emerge from the mists of legend, comes to an end in a spectacular and shocking series finale which finds striking the new land and in England.