Who is the actor? He's a two-time Oscar nominee who you might recognize from movies like Minority Report, Shutter Island, and Extremely Loud & Incredibly Close.
Who is he playing? The Three-Eyed Raven is the strange beast who Bran sees in his dreams, then finally encounters at the end of season four. Struan Rodger played the character the first time, but now von Sydow will be taking over.