The hotly-anticipated final season of Game Of Thrones is set to return on April 14.

And a cast list for the opening episode has allegedly been leaked on Friday, revealing the surprising return of some familiar faces.

According to Watchers On The Wall, a community for fans of the HBO show, both Kristofer Hivju and Richard Dormer are reportedly reprising their roles as Tormund and Beric Dondarrion, respectively.

Tormund and Beric were last seen on top of The Wall during the season seven finale when the Night King used Daenerys' fallen dragon Viserion to destroy the ancient structure so that he and the White Walkers could pass into Westeros.

As the dragon destroyed The Wall, Beric and Tormund were seen jumping out of shot and it was not clear whether or not the two characters had survived the encounter.

Other surprising characters that are reportedly set to return in the final season include Tobias Menzies’s Edmure Tully, and Lino Facioli's Robin Arryn.

MailOnline have contacted representatives of HBO who declined to comment.

This comes after Game of Thrones fan account dedicated to show star Peter Dinklage and French film magazine Premiere claimed series eight will be the longest in the show's nine-year run.

A list of the season's six episodes, along with the running time for each, was posted online with each installment running between 60 and 80 minutes.

Totaling seven hours and 20 minutes, this will reportedly will be the show's joint-longest series in run times despite having the smallest episode count, which just six installments to wrap up the much-loved HBO fantasy.

Posting the run times along with a poster of the show's air date, the account simply wrote: 'The run times for each of the six episodes in Game of Thrones ⁠season 8!'