This scene almost didn't make it to air... Bjorn's Viking future is looking bleak. 'Vikings' Season 4: Episodes To Cover A Massive Time Span, Actor Teases Major Power Upset The prince is currently toughing it out alone in the Nordic wilds, but by episode 4, Ragnar's (Travis Fimmel) son will find himself at the center of the most gruesome scene Vikings has ever shot - and that's even taking into account season 2's blood eagle and Aslaug's season 3 executions.