Yuri Kolokolnikov has been cast on Game of Thrones Season 4.

The relatively unknown Russian actor will play a key role on this HBO epic in 2014, according to Entertainment Weekly, coming on board as Styr, the Magnar of Thenn.

This character is in charge of Thenn, a warring tribe from beyond The Wall that is poised to invade Westeros under the guidance of Mance Rayder, as teased at the conclusion of Game of Thrones Season 3.

Will Jon Snow be able to warn those in Castle Black in time to prepare them for battle?

HBO is yet to announce a premiere date for Game of Thrones Season 4, but look for new episodes to start airing in late March or early April.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.