Ubbe achieves one of Ragnar's dreams; Ivar hatches a new plan in Kattegat, while preparing for a divine arrival; a settler in Iceland returns in a terrible state; King Alfred faces his greatest threat yet.
An unexpected turn among the settlers leaves Floki powerless. King Alfred confronts Judith. Bjorn must strike a deal with Harald. Wessex is once again threatened by a Viking force, but who will lead the Saxon army to defend the Realm?
Hvitserk is severely tested. Floki makes an amazing discovery. Freydis gives Ivar a surprise. Ubbe negotiates with the three Danish Kings that have massed their armies in Reading, but the negotiations may have a perilous outcome.