Season 2 of Vikings continues the epic saga of Ragnar Lothbrok as he rises in power and faces new challenges both at home and abroad. The season begins with a dramatic conflict between brothers, as Ragnar goes to war against Rollo, who has allied with Jarl Borg. After a brutal battle and uneasy reconciliation, Ragnar turns his focus to expansion and exploration, forging fragile alliances with other Norse leaders.