Viking Ragnar Lothbrok is a young farmer and family man who is frustrated by the policies of Earl Haraldson, his local chieftain who sends his Viking raiders east to the Baltic states and Russia, whose residents are as poor as the Norsemen.
Ragnar wants to head west, across the ocean, to discover new civilizations. With assistance from his friend Floki, Ragnar builds a faster, sleeker fleet of boats to help him make it to the Western world.
Through the years Ragnar, who claims to be a direct descendant of the god Odin, continues to struggle with Earl until the two face each other in a final battle for supremacy. Following that, Ragnar goes on a search for new lands to conquer
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.