New Image Of The Buffed Out Thor When Kenneth Branagh walked through the doors of Marvel Studios to discuss directing Thor, executives greeted the Brit with two questions. The first was a polite "How are you doing?" The second was whether Branagh had ever been to Comic-Con. "I think they were warning me," says Branagh, known more for his adaptations of Shakespeare than superhero stories. "They said to brace myself, that I'd never seen anything like it." Not unless Branagh spends much time dressed as Chewbacca. But if you're making a movie about heroes with a predilection for capes and spandex, you had better be prepared to face the critical eyes of Comic-Con, the nation's largest gathering of fanboys, Twilight moms and all variants of geeks in between. The four-day San Diego convention, which kicks off Thursday after a preview Wednesday, will draw more than 125,000 pop-culture fanatics of film, television, comic books and video ga