First clip and cast photos from Vikings season 3. Season three of HISTORY’s hit scripted drama series VIKINGS returns on Thursday, February 19 at 10 p.m. ET. The new 10-episode season begins with Ragnar ( Travis Fimmel ) as King and follows the great responsibility that now rests on the shoulders of the former farmer. “ Mercenary ” – Thursday, February 19 at 10 p.m. (Season Premiere) Ragnar and Lagertha’s fleets depart Kattegat once more for Wessex and this time they bring a group to colonize there. King Ecbert hosts the Norsemen and proposes a deal. Despite the misgivings of some of the other leaders, Ragnar leads his forces into battle once more, but this time as allies of Wessex. See all the photos after the Jump... With the promise of new land from the English, Ragnar leads his people to an uncertain fate on the shores of Wessex. King Ecbert (Linus Roache) has made many promises and it remains to be seen if he will keep them.