Via James Hibberd over at EW, fans have learned that Russian actor Yuri Kolokolnikov has been cast in the role of Styr, the Magnar of Thenn. “Magnar” is a word in the Old Tongue of the First Men, meaning “lord”. The Thenns are an isolated group of wildlings from the far, far north of the inhabited lands beyond the Wall, and in the novels they treat the Magnar almost as a deity. The character is introduced early in A Storm of Swords—in fact, Jon at first mistakes him for Mance Rayder—but obviously the show trimmed the character from the corresponding season…. and now he’s back. It will be interesting to see his role, given his later introduction, but it’s likely a safe bet that he’ll be involved in the penultimate episode of season 4, directed by Neil Marshall.
via Game of Thrones: News http://www.westeros.org/GoT/News/Entry/Styr_the_Magnar_of_Thenn_Cast