10 More Harry Potter Stars We Would Love To Join Game Of Thrones

10. Maggie Smith

As no-nonsense Minerva McGonagall, Smith was the kindly Deputy Head of Hogwarts, and head of Gryffindor, and one of Harry's many guardians. A varied career across stage and screen mean that Maggie Smith really is a national treasure. From Othello (1965) to The First Wives Club (1996), Smith rightly deserves her damehood. The 81-year-old is said to be "astonished" at winning and Emmy for her role as Violet Crawley, Dowager Countess of Grantham, in ITV's Downton Abbey.

Ending after six seasons, the latest rumours are that Smith could reprise her role for the long-awaited Downton feature-film. As for Game of Thrones, Smith's stern looks and sharp tongue means she could be a formidable verbal opponent for Dame Diana Rigg's Olenna Tyrell. Imagine that war of words!