In 2012 , McElhatton joined the cast of the popular HBO television series '' Game of Thrones '' , beginning in the second season , playing the character of Roose Bolton . From the fifth season on he was promoted to series regular . In 2015 , he played one of the protagonists in the horror film '' The Hallow '' , which was presented at the 2015 Sundance Film Festival
2015 Sundance Film Festival
2015 Sundance Film Festival
Michael McElhatton