Did Ragnar really manage to become friends with Ivar?
That was finally addressed on Vikings Season 4 Episode 15 when it became clear that they would need to put their differences aside if they had any hope of taking the Saxons down.
However, as they got closer to their big plan coming to fruition, they realized that someone within their team could be passing on information about their big plan.
Use the video above to watch Vikings online to get caught up with the latest developments for the characters on this hit drama series.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.