Vikings Floki will pay dearly for the murder of Athelstan, but will Ragnar's vengeance rob the warrior of his life?

'Vikings' Season 4: Bjorn To Kill Rollo? Alexander Ludwig Teases Revenge

Kattegat's boatwright made quick work of Ragnar's (Travis Fimmel) closest confidant in season, and when season 4 begins, Floki (Gustaf Skarsgård) will have to pay for his crimes. It seems Floki's humiliating failure at the walls of Paris was not nearly punishment enough.

"It's a huge issue that has to be dealt with. You can speculate on how long Ragnar has known it was Floki. Is that why he set Floki up to lead the attack, knowing he would fail? That's one valid interpretation," series creator Michael Hirst told Zap2It. "Floki is going to be a big, big issue. In the coming season, that storyline takes very interesting twists and turns."

'Vikings' Season 4: Go Behind The Scenes With Katheryn Winnick, Lagertha's 'Amazing Story' Teased

The series is not averse to killing of main characters in the middle of a season, and it remains to be seen if Floki will survive the extended 20-episode season. Many fans, however, may take solace in the fact that Skarsgård was still on set as the series continued to film the second third of season 4 at the start of September. Check out the photo below from Katheryn Winnick (Lagertha).

 The goose without the eyeliner.. #Floki #Lagertha #Ireland #behindthescenes

A photo posted by Katheryn Winnick (@katherynwinnick) on Aug 31, 2015 at 12:02pm PDT

Do you think Floki will survive the season? Sound off in the comments below!

Find out more when Vikings returns to the History Channel in 2016.