PUBLISHED: 10:00, Thu, Sep 17, 2020 | UPDATED: 10:00, Thu, Sep 17, 2020
Vikings season 6B is the final instalment in the series, which airs on History and Amazon Prime Video. The first half of season six saw Ubbe (played by Jordan Patrick Smith) leave Kattegat to find new lands in Iceland. Fans think Ubbe will become the next Bjorn Ironside (Alexander Ludwig) and will claim victory in battle.
Vikings season six saw Ivar the Boneless (Alex Høgh Andersen) join Prince Oleg (Danila Kozlovsky) in the Rus battle against the Scandinavian Vikings.
Ivar stabbed his brother Bjorn through the stomach and fans were convinced he had died, however, a new trailer for season six, part two, shows Bjorn is very much alive.
Seeing his brother alive clearly shocked Ivar, and he may start to come to the realisation his brother cannot be defeated.
However, some fans believe Bjorn is now too weary to continue the fight, and he may call on his brother Ubbe to return from Iceland and lead the battle.
Ubbe had moved with his wife Torvi (Georgia Hirst) to Iceland to meet the famous wanderer Othere (Ray Stevenson), discover new lands, and hopefully find out what happened to friend Floki (Gustaf Skarsgård) along the way.
READ MORE: Vikings season 6B theory: Will Ivar switch sides and betray Oleg?
Vikings season 6B: Ubbe may defeat Ivar in part 2 (Image: Sky/History)
Vikings season 6B: Ubbe went to Iceland with Flatnose (Image: Sky/History)
He is seen in the trailer for the second half of season six taking part in a battle, but where the conflict takes place is not known.
Fans believe he will take on Bjorn's title "Ironside" as he has not yet been defeated or injured in battle.
KingStark12 said on Reddit: "Bjorn received the title after no one was able to touch him on the battlefield.
"As I've rewatched the later seasons, I've realised that Ubbe has never taken a hit in any fight he's had, other than the obvious duel with King Frodo [Gavan O Connor Duffy].
"Hvitserk [Marco Ilsø] has been punched and knocked down in almost every battle, Ivar was knocked down from his carriage in York, in the later seasons Bjorn has taken some big hits, as has King Harald [Peter Franzén].
"But other than his duel, I don't think Ubbe has ever been