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

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

Ragnar’s plan comes to fruition. The Viking army lands on the coast of Northumbria.

The Viking army begins to gather in Kattegat. Lagertha must remain vigilant in the absence of her son, Bjorn.

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

Ragnar and Ivar plot against the Saxons and reach a new level of understanding.

Lagertha attempts to fulfill a long-held ambition. Ragnar negotiates an unexpected concession from King Ecbert.

Ragnar’s fleet is shipwrecked and washes up on the Wessex coast, but without enough survivors to form a credible force, Ragnar and Ivar have a difficult decision to make. Rollo…

The Kattegat locals chide Ragnar that the gods have deserted him as he struggles to crew his voyage to Wessex. It’s Bjorn who has charisma now as he prepares to…

Ragnar returns to Kattegat and formulates a plan to head back to Wessex, where he intends to right past wrongs.. Meanwhile, Lagertha plans a power play in Kattegat and Bjorn…