"Vikings" Season 2, Episode 3, titled "Treachery" (2014), follows Ragnar and King Horik's raid on Wessex while Jarl Borg invades Kattegat, forcing Rollo to defend the city. The episode features a four-year time jump and highlights Athelstan's inner turmoil during the raid. For official, secure streaming options, viewers can utilize platforms such as Netflix or Amazon Prime Video .