See what's ahead on this season of Vikings.

Rollo is welcomed home to Kattegat after Ivar is crowned the new king. Bjorn, Lagertha and Ubbe must flee Ivar’s murderous forces and rely on unsteady alliances to survive.

Heahmund’s (Jonathan Rhys Meyers) loyalty is tested creating an uncertain fate for those in his company. In Iceland, Floki (Gustaf Skarsgård) fights to understand the will of the gods and the new ruler of Kattegat may have met his match.

Heahmund fights to convince King Alfred of his religious intents in defense of the Crown. Ubbe and Torvi strengthen the position of the Vikings but not everyone supports their strategy. Another settler disappears in Iceland.

Contrary to the celebrations in Kattegat, grief hits Iceland and Floki (Gustaf Skarsgård) must now make a fated decision. Harald's (Peter Franzén) army approaches Wessex and a conspiracy grows against King Alfred (Ferdia Walsh-Peelo) in Court.

Bishop Heahmund (Jonathan Rhys Meyers) is wracked with guilt as he fights to renounce his passions. Vikings will clash with Saxons on the battlefield leaving a key figure lost in the calamity.

Bjorn (Alexander Ludwig) achieves one of Ragnar's dreams. King Alfred (Ferdia Walsh-Peelo) faces his greatest threat yet. Ivar (Alex Høgh Andersen) prepares for a divine arrival and a settler returns to Iceland in terrible condition.

In York, Bjorn makes a strategic deal. Wessex is once again threatened by a Viking force with concern of who will lead the Saxon army to defend the Realm. An unexpected turn amongst the settlers leaves Floki powerless.

Ivar is treated to a surprise, Hvitserk is severely tested and Floki makes an amazing discovery. Three Danish Kings massed their armies in Reading and Ubbe’s negotiations may have a perilous outcome.

Ubbe (Jordan Patrick Smith) is forced into hand-to-hand combat. Floki (Gustaf Skarsgård) reaches new depths and is met by a shocking sight. Bjorn (Alexander Ludwig) sets off for Scandinavia with an old rival.

A new battle for Kattegat is on and only the gods know who will emerge victorious. Kathryn Winnick, Alexander Ludwig, John Kavanaugh, Peter Franzén and Alex Høgh star.