It is, of course, utterly ridiculous for Sir Ian McKellen must be one of our most bankable stars: Gandalf in the Lord of the Rings trilogy, Magneto in the X-Men films, Sir Leigh Teabing in The Da Vinci Code. When he's not on the silver screen, he's popping up in Coronation Street (briefly, playing a con man), in panto as Widow Twankey, twice, at the Old Vic, and then often on stage. He has played most of the classicalroles and done a stint at the RSC. Next year, he will collaborate with Trevor Nunn, the director, to do a yearlong King Lear. "I've known Trevor since we were at Cambridge together," he says.