The actor will play Bran Stark's mysterious tutor Three-Eyed Raven in upcoming episodes of the show.

The character was introduced in the season four finale, when he was portrayed by Struan Rodger.

The Three-Eyed Raven has the ability to take over the bodies of animals.

The Exorcist star Von Sydow will also appear in the upcoming Star Wars: Episode VII - The Force Awakens, alongside another Game of Thrones star, Gwendoline Christie.