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On Vikings Season 4 Episode 20, Ecbert stays behind in order to formulate his own plan, while Prince Aethelwulf is targeted by the Vikings' battle plan.
On Vikings Season 4 Episode 19, the Viking army rampages through the English countryside while King Ecbert and Aethelwulf seek to defend the realm.
On Vikings Season 4 Episode 18, Ragnar's plan is realized and the Viking army alights on the coast of Northumbria.
On VIkings Season 4 Episode 17, a great Viking army assembles at Kattegat, while Lagertha remains vigilant in the absence of Bjorn.
On Vikings Season 4 Episode 16, Lagertha continues the quest for power in Kattegat, while Bjorn's fleet decides to launch a surprise attack.
On Vikings Season 4 Episode 15, while having to work together to form a plot against the Saxons, Ragnar and Ivar establish a new level of understanding.
On Vikings Season 4 Episode 14, Ragnar acquires a surprising concession from King Ecbert, while Lagertha is near realizing a long-held ambition.
On Vikings Season 4 Episode 13, Ragnar and Ivar deal with an issue involving their crew and Bjorn has a surprising reunion.
On Vikings Season 4 Episode 12, Bjorn's dream got closer within his reach, but did a last minute setback ruin the big plan to make his life better?
On Vikings Season 4 Episode 11, Ragnar has returned to Kattegat where he devises a plan to return to Wessex to right past wrongs on the midseason premiere.