Fans have been waiting for the return of "Vikings" season 4, which is expected to resume this month after the midseason cliffhanger in April. While the midseason premiere has yet to be announced, rumors are rife that the second part of "Vikings" season 4 will see Ivar the Boneless (Alex Hogh Andersen) take over his father's leadership.

Ivar was revealed as full grown in episode 10 when his father Ragnar Lothbrok (Travis Fimmel) returned from Paris. He is also revealed to be the only of his siblings to still have trust in their father's capabilities. It has been long rumored that Ragnar will die this season and that his death will be brought about by one of his sons.

Despite his physical condition, many of the viewers believe that Ivar's role in the series will get bigger. The 11th episode is believed to be bloody with the revelations that in order to reclaim his throne, Ragnar has to battle with whoever has claimed it.

Meanwhile, the rest of Ragnar's sons will also be played by new actors because of the time jump. Hvitserk will be played by Marco Islo, Ubbe will be played by Jordan Patrick Smith, and Sigrid will be played by David Lindstron.

The casting has been kept secret, and when IGN visited the set in October, the actors revealed that none of their families and friends know about their roles. Unlike the younger characters, the grown-up Hvitserk, Ubbe, and Sigurd have a deep hate for their father.

"It's almost a new generation to Vikings. Vikings, staying true to the era, is young men becoming warriors," explained Smith. He added, "To watch four young guys get that jump start that Ragnar got, they're pretty much starting from where he left off, and then you get to see them go even further."

Regarding the change in how the characters view their father, Smith said, "You need other people to come in to keep the fighting and the life of Vikings alive, rather than having old men chopping each other down."