6'5" British TV and film acting veteran Clive Russell has joined the cast of HBO's "Game of Thrones" for its soon to shoot third season says WinterIsComing.Net. Russell has scored the role of Brynden 'The Blackfish' Tully, Catelyn Stark's uncle and a skilled warrior who becomes a key player in Robb Stark's war effort. Russell has had a long and distinguished career on the small screen with roles in the likes of "Middlemarch," "Cracker," "Roughnecks," "Neverwhere," "Spaced," "Happiness," "Waking the Dead," "Coronation St," "Merlin," "The Bill," "Jam and Jerusalem" and "Casualty".