Full episode spoilers.
Bjorn confronts Hvitserk over Lagertha's killing and tells him he cannot forgive him. Ubbe urges their brother to beg for mercy, but Hvitserk describes himself as the gods' instrument in avenging Aslaug. Bjorn orders him bound above a pile of wood and has the fire lit. Before Hvitserk burns, Bjorn signals Ubbe to cut the ropes with his axe. Hvitserk falls into the water and survives, only to be banished into the winter.
Kattegat's people respond uncertainly when Bjorn asks for their support, and Gunnhild speaks on his behalf. Ubbe and Torvi finally prepare to leave for Iceland with Kjetill, while Bjorn remains suspicious of Kjetill's account of Floki. Gunnhild also discovers Bjorn with Ingrid and proposes that he marry Ingrid as a second wife. Bjorn must deal with these strains at home while considering the danger Harald's new position poses to Kattegat.
In Rus, Igor tries to assert his authority over Oleg after Ivar's private encouragement. Oleg strikes the boy and makes clear that he still controls him. His plans for Scandinavia move beyond talk when Rus riders attack a settlement near Vestfold and plant their flag. Harald receives reports of the foreign raiders and turns to the imprisoned Olaf for advice. Olaf recognises that the attackers are claiming land, leaving Harald to face an enemy whose intentions he does not yet understand.