Plot summary
Ragnar and King Ecbert experience separate visions of Athelstan, who relays the words "mercy". Rollo starts to learn the language of Francia. Kalf hires a berserker to assassinate Bjorn, on behalf of Erlendur. Bjorn kills a bear that escaped his trap. Floki and Helga struggle with the death of their daughter. Ragnar approaches the cave and frees Floki. Lagertha sleeps with Kalf and he tells her he loves her. Aethelwulf returns with the rescued Queen Kwenthrith and her son Magnus. Judith's obsession with Athelstan continues. Wessex continues preparing its soldiers. In Francia, Count Odo prepares to defend Paris.
Credits
Adapted from Wikipedia contributors, Vikings season 4. HTML formatting and reference markers removed.