After Sigurd's death, Ubbe, Ivar and Hvitserk rule jointly over their newly acquired land in East Anglia. Bjorn and Halfdan sail back to the Mediterranean Sea; Floki sets sail for the unknown; King Harald heads back to Kattegat. Meanwhile, Bishop Heahmund arrives at King Ecbert's villa, celebrates the late sovereign's funeral, and begins rebuilding the place. Aethelwulf and Judith are in exile with princes Aethelred and Alfred, the latter struck by sickness. Ivar persuades his brothers to go nor
After days at sea, Floki finally reaches land, which he believes to be Asgard, the land of the Gods. In Kattegat, Harald is held prisoner by Lagertha. He proposes an alliance with her through marriage, but she refuses and rapes him. Harald's men free him and capture Astrid; they leave Kattegat and Harald offers Astrid the same proposition that he had to Lagertha. Prince Alfred has a vision in which Athelstan tells him the Vikings are in York, so King Aethelwulf joins forces with Bishop Heahmund.
Floki explores the new land he has encountered. In Norway, Astrid tempts Harald with the possibility of her alliance, while resisting his sexual advances. In the Mediterranean, Sindric advises Bjorn to arrive as a trader, with a few ships, and not as a warrior in command of an entire fleet. In England, the Saxons led by King Aethelwulf and Bishop Heahmund attack York, but are led into a trap. Aethelwulf's son Aethelred is wounded and the Saxons are forced to retreat. Ubbe and Hvitserk propose a
Bjorn reaches Sicily, and agrees to act as bodyguard to its commander Euphemius. However, Sindric discovers that Euphemius is merely a client of the Arab Emir Ziyadat Allah, and Bjorn asks to visit him. Euphemius refuses but is persuaded to agree by Kassia, a famous nun, and they set sail for Kairouan in North Africa. Meanwhile, in Kattegat, Ubbe agrees to ally with Lagertha against both Ivar and Harald. In Vestfold, Astrid finally agrees to Harald's proposal, and they are married. Floki asks th
In York, Saxon celebrations are cut short when Vikings appear from the sewers and engage in battle. Heahmund is surrounded, but spared by Ivar, and captured. The Vikings retake and garrison the city, as the Saxons retreat. Ivar and Hvitserk sail for Kattegat, taking Heahmund with them. In North Africa, Bjorn travels by caravan across the desert to meet Emir Ziyadat Allah, who welcomes him and offers to trade. Euphemius disappears and, at a banquet, the Emir explains that he had defected to suppo
Floki and the settlers prepare for their voyage but are betrayed to Lagertha, who is angry but lets them sail. On reaching the new land, the settlers discover that it is not as fertile as Floki had told them. Margrethe is vexed by Lagertha's leadership; the Queen threatens to enslave her again if she continues to plot against her. In England, the Saxons have retreated; Alfred swears at Ecbert's grave to pursue the former King's vision of uniting the country. After collapsing during Mass, Alfred
Alfred reaches Lindisfarne, in search of the memory of his father, and hears his voice as he prays. Floki and the settlers begin creating a settlement near hot springs in their new land. Floki proposes a co-operative, democratic approach, but Eyvind does not trust him and accuses Floki of wanting to be King. Astrid tells Harald that she is pregnant, while Ivar and Heahmund discuss their plan of attack. Bjorn returns to Kattegat, where Lagertha has allied with King Svase of the Sámi. Bjorn reject
Alfred returns from Lindisfarne, and argues that the Saxons must build a navy as the only way to stop further Viking incursions. In the new land, Floki proposes building a temple to Thor, but is opposed by Eyvind who warns that they all will starve come winter. Meanwhile, the armies of Lagertha, Bjorn, and Ubbe, and of Harald, Ivar, and Hvitserk, meet above Kattegat. Lagertha proposes peace talks, but Harald, then Ivar, reject a settlement. Before battle, Ivar takes Astrid and a third of their a
In the aftermath of the battle, Heahmund recovers, makes advances and pledges loyalty to Lagertha. Hvitserk secures reinforcements from Rollo, on condition that Bjorn's life is spared. Bjorn seeks peace with Ivar and Harald, but is rejected; Ivar moves to have him killed but is stopped by Harald. Ubbe, regretting marrying Margrethe, seeks solace with Torvi and the two have an affair. In Wessex, Aethelwulf dies and Judith persuades Aethelred to reject the throne and instead propose to the Witan t
In Floki's colony, Floki urges Eyvind to not seek revenge for Bul's death, offering to make him lawgiver, in exchange for not starting a blood feud. When Thorgrim is found dead, Floki proposes that he himself be sacrificed to the gods. In Kattegat, Margrethe meets the Seer and reveals her ambitions to become queen. The Seer calls her mad and predicts that she will never be queen of Kattegat. The army of Lagertha faces those of Ivar and Harald. As they do battle, Hvitserk remembers Ivar accusing
Ivar enters Kattegat and declares himself its new king. Ivar and Hvitserk celebrate their victory; Harald is mourning Astrid and is haunted by his murder of Halfdan. Rollo arrives and Ivar tells him that Lagertha, Bjorn, and Ubbe have vanished. Rollo guesses that they are hiding in the same hut he had sought shelter in decades earlier. Rollo urges Lagertha and Bjorn to return with him to Frankia, revealing himself to be Bjorn's biological father. Bjorn rejects both Rollo's offer and Rollo as his
At Heahmund's suggestion, Lagertha, Bjorn, and Ubbe are to be allowed to settle in East Anglia in return for fighting against other Viking incursions. Heahmund is informed that his bishopric has been given to Cuthred, due to Heahmund being assumed dead. In Kattegat, Ivar is engaged to Freydis. When his impotence prevents him from having sex with her, Freydis consumes Ivar's blood, claiming this will make her conceive, but she then secretly has sex with Ivar's slave. In the colony, Frodi blames E
Ubbe and Torvi agree to Alfred's demand for their conversion, but this alienates Bjorn. Bjorn is approached by and bonds with Magnus, who seeks vengeance against Alfred. Alfred and Aethelred clash over whether to punish Heahmund for Cuthred's murder. Alfred chooses to leave judgement of Heahmund to God, to the dismay of his nobles. Heahmund spreads the story that Aethelred might be leader of a conspiracy against Alfred. Harald leaves Kattegat for York to prepare a raid on Wessex. He manipulates
Ivar has a shield-maiden he claims to be Lagertha sacrificed, as Hvitserk becomes increasingly conflicted. As Ivar executes rebels, Hvitserk consults the Seer who offers fearful visions of the future. In Iceland, Floki is visited by a vision of Thorunn who reveals her murder by Helgi's brother, Asbjorn. Floki exiles Eyvind and his family from the colony. In England, Ubbe trains Alfred in preparation for Harald's raid. Magnus suggests to Bjorn, Ubbe, and Lagertha that they should join Harald. Ubb
Ivar has his men covertly cremate the Seer's body, while publicly promising to bring the people responsible to justice. In England, Heahmund has a vision of Hell that drives him to renounce Lagertha, who accuses Heahmund of never having loved her. Alfred has Lord Cyneheard arrested for treason and Judith tortures him for information about the conspiracy. Harald's army arrives in Wessex. Ubbe goes to speak with Harald, offering a large sum of money for him to leave. Later Magnus arrives to join H
Alfred tells Judith that he has forgiven Aethelred. She confronts Aethelred, who says that loyalty to Alfred prevented him from leading the conspiracy. News reaches Ivar of Harald's defeat, and Ivar plans his own invasion of Wessex. Meanwhile, Alfred grants the Norsemen East Anglia; Bjorn is unhappy about Ubbe and Torvi's conversion to Christianity. With Gunnhild, he travels north to make a deal with Harald, after Gunnhild reveals his plan to attack Kattegat. Hvitserk meets a merchant and become
Aethelred is buried as Alfred regains his health. Judith reveals that she had poisoned him to death; Alfred is furious but Judith maintains that doing terrible things is necessary to stay in power. Hearing that a large fleet of Danes is approaching Wessex, Ubbe convinces the king to make him leader of his army. In York, Harald makes the same deal with Bjorn that he had with Ivar: when Bjorn dies, Kattegat will be Harald's. Harald approaches Gunnhild in private and admits his feelings; Gunnhild i
King Olaf asks Hvitserk about Ivar's rule; Hvitserk declares his brother a tyrant and asks Olaf to help overthrow him. An amused Olaf instead has Hvitserk tortured. Nevertheless, Hvitserk refuses to change his mind about Ivar. Impressed, Olaf decides to support him. In Kattegat, Ivar orders Thora's arrest and accuses her of fomenting hatred toward him; she contends that in Ragnar's time, all were free. Ivar lets her leave, but she is soon taken by his soldiers and burned alive, along with other
In England, King Alfred's mother, Judith, dies from cancer. Ubbe fights King Frodo and wins, but is badly injured. As he is about to die, Ubbe calls Odin for help. Because of Ubbe, the war is prevented and Kings Hemming and Angantyr settle in East Anglia with their people. Meanwhile, Lagertha is recalling what happened to her after the battle. She remembers that the witch cut her hair and told her she would then be a new person. Ubbe and Lagertha leave England for Kattegat. In Kattegat, Freydis
The combined armies attack the walls of Kattegat from two directions. However, the defenses are too strong and they are forced back. Magnus is killed by Ivar's captain White Hair. Bjorn appeals to the citizens and says that Ivar is their enemy. At night while Ivar celebrates his victory, Freydis sneaks out to the attackers' camp. She exposes Ivar's murder of Baldur and Thora and a hidden door. A second assault begins and most of the defenders give no resistance, leaving Ivar's housecarls outnumb