Ivar the Boneless asserts his leadership over the Great Heathen Army; Lagertha reigns as Queen of Kattegat. Ragnar’s sons plot their next moves. Bjorn follows his destiny; Floki submits himself to the will of the Gods.
- S501 E1 - The Fisher KingTensions mount between the sons of Ragnar Lothbrok as the Vikings continue to threaten the very heart of England. As the Great Army moves to take York, with King Aethelwulf and his family still in hiding, Heahmund, the warrior bishop, must rally the Saxons to defend the Realm.
- S501 E2 - The DepartedAs 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.
- S501 E3 - HomelandCelebrations 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.
- S501 E4 - The PlanGuided 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.
- S501 E5 - The PrisonerIvar meets his match in Bishop Heahmund, while Floki returns to Kattegat and Bjorn receives a lavish welcome in North Africa.
- S501 E6 - The MessageLagertha 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.
- S501 E7 - Full MoonBjorn returns to Kattegat to learn that an attack is to take place during the next full moon. Ivar must decide if he can place his trust in a former enemy on the battlefield.
- S501 E8 - The JokeThe 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.
- S501 E9 - A Simple StoryThe 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.
- S501 E10 - Moments of VisionA sense of doom looms over Kattegat as bloodshed ensues. As the defeated army flees in the face of the victors, a legendary warrior makes his way home.