Battles, treachery and power grabs rage on in Vikings Season Four. Ragnar's return to Kattegat following his shameful defeat in Paris escalates tension among his sons. Determined to save what remains of his legacy, Ragnar recruits Ivar for a perilous voyage to England, where he plans to attack the Saxons. Meanwhile, a prophecy that a woman will one day rule Kattegat deepens Aslaug and Lagertha's feud.

Wide screen (1.78:1). Special features: The queen & the shieldmaiden; Vikings, Valhalla and the legacy of Ragnar Lothbrok; deleted scenes.

Disc 1:The outsider -- The vision -- Two journeys -- In the uncertain hour before morning. Disc 2: All his angels -- Crossings -- The great army. Disc 3: Revenge -- On the eve -- The reckoning.