Ragnar goes on a trip of initiation with his son. Meanwhile, he thinks he has finally found a way to sail ships to the west. However, his beliefs are seen as insane so he chooses to go against the law.

The stage is set for the first journey west by Ragnar Lothbrok as he gathers a crew willing to risk their lives to travel into the unknown.

After his successful raid, Ragnar and his crew joyously return home with their riches. Earl Haraldson doesn't hesitate to summon Ragnar to the great hall where he lays claim to the entirety of the treasure. He allows the crew to take one thing from the hoard and Ragnar selects Brother Athelstan as his slave. From Athelstan, he learns the political structure in England and wants to learn some of the language. Haraldson sanctions a new raid but insists that one of his men, Knute, join Ragnar's crew. Ragnar takes his wife this time and surprises everyone by putting Athelstan in charge of the farm.

The Vikings head back to England to see what other treasures this new world has to offer. This go round Ragnar and his crew sail out with Earl Haraldson's permission.

In the Great Hall of Kattegat, a seer reads Earl Haraldson's future and tells him that Ragnar Lothbrok searches for his death.

Ragnar, weak and still hurt, must meet the Earl head-on after it comes to light that Rollo has been tortured on Haraldson's orders.

Three Viking ships sail upriver towards the very heart of power in eastern England: the Royal Villa of King Aelle.

The traditional pilgrimage to Uppsala to thank the gods brings a torrent of emotions for Ragnar, Lagertha, and Athelstan.

At the behest of King Horik, Ragnar assembles a small party to travel to Gotaland (modern day Sweden) to resolve a land dispute with the area's leader, Jarl Borg.

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. A storm pushes the Viking fleet to a new destination, and on the beaches of Wessex, Ragnar and his men may have met their match.

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.

King Horik returns to Kattegat with a surprising proposition for Ragnar; Lagertha runs into a less than enthusiastic homecoming from her new husband; Athelstan becomes confidant to King Ecbert.

Ragnar and King Horik clash over differences; King Aelle arrives in Wessex; Ecbert has an eye on a new alliance.

Princess Aslaug's latest prophecy comes to fruition; Ragnar and Horik have very different ideas about the true purpose of their trip to Wessex.

Ragnar's warriors march on to King Ecbert's villa and are met with a vicious surprise.

Ragnar returns to Kattegat after the defeat in Wessex and places his trust in those who have stayed by his side all this time.

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.

Preparations for the Paris raid pick up speed, and Rollo thinks about the Seer's prophecy.

The Viking fleet causes panic in Paris; the Emperor Charles declares he will remain in the city.

The Viking army sets out and Paris goes into lockdown as the army prepares the defense.

The Vikings hit Paris with a second assault; Emperor Charles has to make a difficult decision.

With one last chance to take Paris, Ragnar and his Viking troops take a daring chance. Ragnar asks Bjorn for a favor that could change the course of Viking history.

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.

Ragnar reveals his plan to raid Paris again, and although the fleet is storm-tossed as it sets out, the challenge lies in Frankia where Rollo awaits. Meanwhile, Ecbert dispatches Aethelwulf and Alfred on a pilgrimage to Rome.

Now aware that Rollo has betrayed him, Ragnar carries out his plan of attack, which has dire consequences. Ecbert is given an offer from Prince Wigstan of Mercia. Harbard causes a stir with the women of Kattegat.

After facing defeat on the river, Ragnar refuses to retreat, prompting him to change his methods of attacking Paris. Count Odo's plot against Charles and Rollo backfires. Ecbert now rules Mercia, which dissatisfies Kwenthrith.

The Vikings finally reach the river. Aethelwulf and Alfred reach Rome. Erlendur makes his move against Bjorn. Sigurd makes a shocking discovery in Kattegat. Ecbert is crowned king in Mercia.

A ferocious battle between the Vikings and the Franks eventually comes down to Ragnar against Rollo. The outcome will seal the fate of the two brothers.

Ragnar has returned to Kattegat where he devises a plan to return to Wessex to right past wrongs.

Ragnar seeks to equip his voyage to Wessex, even while being warned that the gods have deserted him. Bjorn prepares to fulfill his dream of exploring the Mediterranean.

Ragnar and Ivar face a difficult decision in regards to their crew; Bjorn has an unexpected reunion.

King Aelle can't hide his pleasure when Ragnar arrives in a cage and shows him no mercy.

Bjorn's fleet sails onward and launches a surprise attack. Back in Kattegat, Lagertha continues in her quest for power.

The Great Army is gathering in Kattegat, as Lagertha is saved by Bjorn Ironside from the hands of Ragnar's sons. Rollo is establishing the kingdom of Normandie as a safe-heaven for all vikings in search for land.

Ragnar's plan comes to fruition; the Viking army lands on the coast of Northumbria.

The Viking army causes panic in the English countryside as King Ecbert and Aethelwulf plan the defense of the Kingdom of Wessex.

Prince Aethelwulf finds himself subject to the Vikings' battle master plan; Ecbert remains behind with a plan of his own.

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. Bjorn Ironside finds himself in a new territory and must convince the local commander he is a trader and not a raider.

As the Vikings establish their stronghold in York, Ivar is determined to lead the Great Army. In Kattegat, Lagertha misjudges King Harald and pays a heavy price. Floki arrives at a mysterious land.

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. Bjorn Ironside finds himself in a new territory and must convince the local commander he is a trader and not a raider.

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

Lagertha is betrayed, and Bjorn must find a way to support the distraught queen; Floki and his settlers arrive in a new land, but it is far from what they expected.

Bjorn returns to Kattegat to learn that an attack will take place during the next full moon; Ivar must decide if he can place his trust in a former enemy on the battlefield.

The battle for Kattegat begins. As the two armies line up to fight, the Great Heathen Army must decide between a final plea for peace or all-out war. Floki faces discord amongst the settlers.

The army leaders consider their options in the aftermath of the battle. In Floki's camp, all hopes of binding the community together are dashed as tragedy unfolds.

A sense of doom looms over Kattegat as bloodshed ensues, but as the defeated army flees in the face of the victors, a legendary warrior makes his way home.

Ivar is crowned the new king of Kattegat just in time to welcome Rollo home; Bjorn, Lagertha and Ubbe must rely on unsteady alliances to survive.

Bjorn, Lagertha and Ubbe face an uncertain fate as Heahmund's loyalty is tested; Floki fights to understand the will of the gods in Iceland; Ivar may have met his match in Kattegat.

Heahmund must convince King Alfred that his actions are in defense of the crown; Ubbe and Torvi strengthen the position of the Vikings, but not all in the Viking camp support their strategy; another settler disappears in Iceland.

King Harald and his army approaches Wessex while Aethelred is about to make a huge decision about his brother's fate.

Ubbe achieves one of Ragnar's dreams; Ivar hatches a new plan in Kattegat, while preparing for a divine arrival; a settler in Iceland returns in a terrible state; King Alfred faces his greatest threat yet.

An unexpected turn among the settlers leaves Floki powerless. King Alfred confronts Judith. Bjorn must strike a deal with Harald. Wessex is once again threatened by a Viking force, but who will lead the Saxon army to defend the Realm?

Hvitserk is severely tested. Floki makes an amazing discovery. Freydis gives Ivar a surprise. Ubbe negotiates with the three Danish Kings that have massed their armies in Reading, but the negotiations may have a perilous outcome.

Ubbe is forced into hand-to-hand combat. Floki reaches new depths and is met by a shocking sight. Bjorn sets off for Scandinavia with an old rival.

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.

Ragnar returns to Kattegat after the defeat in Wessex and places his trust in those who have stayed by his side all this time.

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.

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. Bjorn Ironside finds himself in a new territory and must convince the local commander he is a trader and not a raider.

As the Vikings establish their stronghold in York, Ivar is determined to lead the Great Army. In Kattegat, Lagertha misjudges King Harald and pays a heavy price. Floki arrives at a mysterious land.

The Viking fleet causes panic in Paris; the Emperor Charles declares he will remain in the city.

Bjorn's fleet sails onward and launches a surprise attack. Back in Kattegat, Lagertha continues in her quest for power.

An unexpected turn among the settlers leaves Floki powerless. King Alfred confronts Judith. Bjorn must strike a deal with Harald. Wessex is once again threatened by a Viking force, but who will lead the Saxon army to defend the Realm?

In the Great Hall of Kattegat, a seer reads Earl Haraldson's future and tells him that Ragnar Lothbrok searches for his death.

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.

The stage is set for the first journey west by Ragnar Lothbrok as he gathers a crew willing to risk their lives to travel into the unknown.