The warrior is seen with blood across his face as he screams in agony while pinned down by an enemy's spear and left defenceless.
After his fate was teased throughout the current series, the latest clip has sparked fear in fans that the eldest Son of Ragnar won't survive.
Alexander Ludwig has stayed tight-lipped on his character's fate, but he has spoken to TV Junkies about facing the fact his character could soon meet a grisly end.
He explained: "As the show progressed and we started getting farther and farther away from the historical accuracy of it all, everyone for more nerves about it.
"For me, if he goes, I want it to be memorable and for a good reason… Whether or not I go isn't so much of a fear for me, but my biggest fear would be not doing the character and fans justice."
The heart-pounding trailer had fans flocking to social media to comment on the dramatic battle.
One fan mused: "Next episode of Vikings is about to be bloody!"
Another Vikings viewer commented: "Team Bjorn, gather here let's pray to Odin for Bjorn and Hvitserk to win this battle."
The series finale of Vikings will air in the US on January 30 2019 and will be on Amazon Prime the following day for UK viewers.
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