Here's Everything We Learned About Rollo's Return to Vikings 

One of the biggest twists of the Vikings mid-season finale was Rollo (Clive Standen) returning to Kattegat, so we knew that he was back, but not why. We can finally shed a little more light on that situation.
Keywords: vikings, season 5, 5b, michael hirst, clive standen, san diego, comic con, 2018, panel, rollo, Return, details, preview