After Ragnar goes with his son on a trip of initiation, he's forced to go against the law, as his beliefs on sailing ships to the west are seen as insane.
Ragnar Lothbrok embarks on a perilous journey as he gathers a fearless crew who are willing to risk everything to travel into unknown lands in the west.
As Ragnar and his crew return home victorious after their successful raid, Earl Haraldson demands the entirety of the treasure they brought with them. Ragnar chooses Brother Athelstan to be his slave.
With Earl Haraldson's permission, Ragnar and his crew head back to England to discover more treasures from the new world.
As Earl Haraldson brings a seer to the Great Hall of Kattegat to read his future, he informs Haraldson that Ragnar Lothbrok is trying to kill him.
In spite of being still weak after his injury, Ragnar has to meet the Earl after he finds out that Haraldson ordered the torture of Rollo.
Three Viking ships sail towards the Royal Villa of King Aelle, which is the center of power in eastern England.
The traditional pilgrimage to Uppsala to thank the gods stirs strong emotions for Ragnar, Lagertha, and Athelstan.
Upon King Horik's orders, Ragnar brings together a small team to head to Gotaland to settle a land dispute with the leader of the region, Jarl Borg.