The brutal and mysterious world of Ragnar Lothbrok, a Viking warrior and farmer who yearns to explore - and raid - the distant shores across the ocean.
Ragnar and King Horik return to Kattegat; Ragnar places his trust in those who have stood by him.
Season Finale: With one last chance to take Paris, Ragnar, and his Vikings troops take a daring chance. Ragnar asks Bjorn for a favor that could change the course of Viking history.
Ragnar's plan comes to fruition; the Viking army lands on the coast of Northumbria.
A ferocious battle between the Vikings and the French eventually comes down to Ragnar against Rollo. The outcome will seal the fate of the two brothers.
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 re-enforcements have arrived, and Bjorn has an idea that may yet save the day.
Ragnar and Ivar plot against the Saxons and reach a new level of understanding.
A new battle for Kattegat is on and only the gods know who will emerge victorious.
The Viking army embarks and Paris goes into lockdown as the army prepares the defense, overseen by Odo. The Vikings are determined to make it through the gates of Paris and will stop at nothing to succeed.
Bjorn's fleet sails onward and launches a surprise attack; back in Kattegat, Lagertha continues in her quest for power.
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 battle for Kattegat begins and the Great Heathen Army must decide between a final plea for peace or all-out war. Floki faces discord among the settlers.
Ragnar's warriors march on to King Ecbert's villa and are met with a surprisingly vicious welcome party.
Three Viking ships sail upriver towards the very heart of power in eastern England: the Royal Villa of King Aelle. Ragnar Lothbrok has come looking for ransom in exchange for peace. However, King Aelle has a different plan in mind for these northern heathens.
Bjorn returns to Kattegat. Harald gains a measure of revenge on Olaf. In Kiev, interesting news reaches Ivar and Igor about Prince Dir.
Ragnar and Lagertha's fleets depart Kattegat once more for Wessex but this time they bring settlers. King Ecbert hosts the Vikings and proposes a deal. Despite the misgivings of some of the other leaders, Ragnar leads his forces into battle once more, but this time as allies of Wessex.
Preparations for the Paris raid pick up pace. Porunn and Judith both deliver children, and with new life there is also death. Athelstan tells Ragnar of his re-connection to his Christian faith. Floki interprets a sign from the gods that a sacrifice should be made.
A meeting between two great men may pave the way for future compromise as Ragnar and Ecbert come face to face. Jarl Borg now rules Kattegat and with an iron fist and Rollo must now become the leader his people need in Ragnar's absence.
Lagertha attempts to fulfill a long-held ambition; Ragnar negotiates an unexpected concession from King Ecbert.
The Wessex Viking raid is in full swing and King Ecbert finds himself facing an entirely new kind of foe. While Ragnar races to dominate in the West, Jarl Borg has his own plans in store for the future of Kattegat.
Ragnar and King Horik clash over how to dispense justice to Jarl Borg. In Wessex, King Aelle arrives and Ecbert has an eye on a new alliance.
Entry to Valhalla eludes Ragnar, but as he lies in his sick bed in Kattegat events unfold beyond his control. Bjorn orders the arrest of Floki for Athelstan's murder while in Paris, Rollo betrays the last of his Viking supporters to strengthen his position in the French court. In Hedeby, Kalf announces joint earldom with Lagertha, but is power sharing Kalf's true intention and is Lagertha actually willing to share what once was hers?
King Horik returns to Kattegat with a surprising proposition for Ragnar. Lagertha runs into a less than enthusiastic homecoming from her new husband. Athelstan, struggling with his own inner demons, becomes confidant to King Ecbert.
The Vikings go all out for a second assault on Paris. Recognizing the desperate state of affairs for his city, Emperor Charles must make a difficult decision. In Wessex, Judith is compelled to make a difficult decision of her own.
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