Vikings

The battle begins between Ragnar and King Horik's forces against Jarl Borg. Borg is joined by Rollo, and this Viking clash pits brother against brother.

Four peaceful years have since passed with Ragnar as Earl. The time has come for an unlikely alliance to band together in pursuit of a common goal - a new raid on England.

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.

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 and Ragnar unite once again; Aslaug must face the truth of her prophecies; Athelstan struggles to define his faith; Bjorn must once again make a choice.

Ragnar and Lagertha's fleets depart Kattegat once more for Wessex but this time they bring settlers.

Lagertha and Athelstan help to set up the Viking settlement; a mysterious wanderer turns up.

King Ecbert visits the developing Viking settlement as the first harvest is sown.

There is bitterness in the camp, Floki is angry over the alliance with Ecbert.

The fleet returns to Kattegat to discover tragic circumstances await.

As Ragnar lies in his sick bed in Kattegat, events unfold beyond his control.

Ragnar and Floki are still at odds; Rollo makes great attempts to win over his new bride, Princess Gisla; Bjorn's survival skills are put to the test; King Ecbert sets the task for his son Aethelwulf to rescue Queen Kwenthrith.

Ragnar tells Floki he has to pay a heavy price for his actions. Rollo finds an ally in Count Odo. Bjorn Ironside finds more than he bargained for in the wilderness.

Ragnar gets to know the new slave woman while Rollo reveals his ambitions to his wife. Bjorn meets an unexpected warrior on his way home.

Halfdan the Black arrives in Kattegat. Floki reveals a secret to Finehair. Ragnar and Yidu become closer. Meanwhile Lagertha settles a score.

Remaining sons of Ragnar plans to retain Kattegat while Bjorne travels somewhere

Celebrations are cut short in the aftermath of the battle at York; Ragnar Lothbrok's sons are pitted against each other as tensions reach an all-time high, and each is forced to choose a side.

Celebrations are cut short in the aftermath of the battle at York; Ragnar Lothbrok's sons are pitted against each other as tensions reach an all-time high, and each one is forced to choose a side.

Guided by Bishop Heahmund's visions, the Saxons devise a battle plan. Ivar the Boneless strategizes on his own as the Vikings undergo increasing pressure.

Ivar meets his match in Bishop Heahmund. Floki returns to Kattegat. Bjorn receives a lavish welcome in North Africa.