<P> The fifth season consists of a double order of twenty episodes , split into two parts of ten episodes ; the second half will premiere in 2018 . The premise of the fifth season differs from the previous four after the departure of Travis Fimmel as Ragnar , and it now follows the adventures of his sons . Jonathan Rhys Meyers is introduced as a major character , after his initial appearance in the fourth season 's finale . </P>
when does the second half of vikings season 5 air
2018