Plot summary
The Vikings retreat and Ragnar's leadership is questioned by Harald. Ragnar tells Bjorn to land near a cliff, and reveals a new plan: they will take the ships overland, behind the Frankish forts. In Paris, Odo tells Charles they should not trust Rollo, and Roland agrees. Gisla reveals that she carries Rollo's child. Odo meets Therese, but she and Roland betray and execute him. Rollo is awarded the Iron Hand of Frankia. In Wessex, Ecbert returns after victory over Mercia but tells Kwenthrith she is no longer Queen. Meanwhile, in Kattegat, Aslaug sees Harbard with other women and is jealous.
She confronts him, and he leaves. In France, Ragnar asks Yidu for more drugs, but she denies him. They argue and she threatens him with revealing his Wessex secret. Ragnar drowns her in a fit of rage. In Wessex, Kwenthrith sneaks into Ecbert's bed and threatens to kill him, but is then killed by Judith.
Credits
Adapted from Wikipedia contributors, Vikings season 4. HTML formatting and reference markers removed.