Bjorn will not be a happy camper when Vikings returns for its fourth season.

'Pacific Rim 2': No Sequel From del Toro? Legendary 'Halts' Production

Ragnar's (Travis Fimmel) son is quickly turning into a leader in his own right, and the prince will exercise his newfound power when he comes face to face with good old Uncle Rollo (Clive Standen). Let's just say Bjorn (Alexander Ludwig) will not be at all pleased with Rollo's decision to team up with the French.

"He's so hurt and he's going to kill him," Ludwig told Zap2It. "In his eyes, there's certain things you can't forgive."

'The Bastard Executioner' FX: What's Next For Wilkin Brattle? Teasers For 'Effigy', 'A Hunger', 'Piss Profit'

Ludwig, who spoke to Zap2It back in July, was unsure exactly what revenge his character would perpetrate. As Floki (Gustaf Skarsgard) is about to learn, Lothbroks can hold onto their anger for astonishingly long periods of time. When Bjorn does explode, Ludwig does not think he will show any compassion.

"The fact is he turned his back on [Bjorn] and our entire community for himself and there's no coming back from that," the actor explained. "Bjorn is so straight-edge in that when he makes a decision, he sticks to it."

Do you think Bjorn will succeed in defeating Rollo? Find out when Vikings returns to the History Channel in 2016.