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As Ragnar prepares to take his troops for one more daring attack on Paris, he makes a request of his son that could change the future of the Vikings for ever.
As a second assault on Paris is being prepared, Emperor Charles must make a difficult decision. Meanwhile, in Wessex, Judith must make her own difficult choice.
The Viking army attacks Paris as the city musters its forces for defense.
The populace of Paris is in a panic after the appearance of the Viking fleet, and Emperor Charles, at the behest of his daughter, announces he'll remain in the city.
While Rollo worries about the Seer's prophecy, the Vikings make final preparations for their raid on Paris.
Tragic circumstances greet the fleet on its return to Kattegat; Lagertha is usurped and convinces Ragnar to help her reclaim her title.
An alliance angers Floki; Princess Kwenthrith makes political moves.
As the new Viking settlement prepare for their first harvest, King Ecbert pays them a visit.
A mysterious wanderer arrives in Kattegat; Lagertha and Athelstan establish a Viking settlement.
King Ecbert proposes a deal to the Vikings in the Season 3 premiere. Later, Ragnar leads his forces into battle.