5. Bill Nighy (Baron Mordo)
With a Doctor Strange movie on the cards, inevitably the major villain is either going to be Dormammu or Baron Mordo (maybe even both) and I can't think of a better British actor to portray the latter than Bill Nighy. Nighy has an incredibly strong screen presence and oozes charisma, but has the years behind him to portray an experienced and seasoned sorcerer who would pose a mighty threat to a young Doctor Strange - perhaps portrayed by someone such as the aforementioned Orlando Bloom. Having seen Nighy as the vampire elder Viktor in the
Underworld series of films, we already know that he can portray a sinister individual on screen. With his hair dyed black, he wouldn't look too dissimilar to the classic look of Baron Mordo that we know from the comics. He'd make an ideal Mordo, I'm sure.