A battle begins, pitting Ragnar and King Horik's forces against Jarl Borg and Rollo in the Season 2 premiere. Meanwhile, Princess Aslaug arrives in Kattegat with a surprise that leaves Ragnar in a difficult predicament.
An unlikely alliance plans a raid on England; Ragnar and his men face off against a formidable foe.
King Ecbert faces a new foe; Ragnar races to dominate in the West.
Ragnar and Ecbert meet face-to-face; Rollo is forced to become a leader.
Lagertha and Ragnar unite to battle Jarl Borg. Later, Bjorn makes a difficult choice.
King Horik presents a surprising proposition to Ragnar; Athelstan becomes confidant to King Ecbert.
Ragnar and King Horik clash over how to punish Jarl Borg. Meanwhile, Ecbert eyes a new alliance.
Aslaug prepares to give birth; Ragnar, Horik and Lagertha set sail for Wessex.
Ragnar's men are engaged in battle while marching to King Ecbert's villa.
Ragnar and King Horik return to Kattegat in the Series 2 finale. Meanwhile, new alliances are formed.