Full episode spoilers.
Harald displays his wealth and ambition in Kattegat while Bjorn refuses to be impressed. Floki spends time with Harald's men and continues teaching Ivar. During a game with other children, Ivar strikes a boy with an axe after being excluded. Floki is shocked, but Aslaug reassures her son. Torvi also identifies the ring Bjorn took from the berserker, connecting the attempt on his life to Erlendur's family.
Ragnar retreats into his relationship with Yidu and the substance she supplies. She says that her father is an emperor, while he tells her about the destruction of the Viking settlement in Wessex and his decision to hide the news. In Paris, Gisla warns Rollo about Odo. Roland and Therese report Odo's ambitions to Charles, whose private composure after their departure suggests that his frightened public manner conceals more calculation.
Ecbert continues considering how to regain Mercia, while privately admitting in prayer that earthly power matters more to him than salvation. In Hedeby, Lagertha announces her pregnancy, and Kalf asks her to marry him. On the wedding day, she stabs him in private, carrying out her earlier promise to kill him for taking her earldom. She then appears before the people in her bloodstained wedding dress and claims sole rule with her shieldmaidens beside her.