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The most passionate Spider-Men, Storm Troopers, Harry Potters and other pop-culture fanatics are headed south for their annual pilgrimage. Comic-Con, the country's biggest comic-book convention, begins Thursday at the San Diego Convention Center. In this July 28, 2007 file photo, Sam Mcclellan, dressed as Captain America, asks a question at a panel discussion for the Marvel Studios film "The Incredible Hulk" at the Comic-Con convention in San Diego. In this July 26, 2007, file photo, Cynthia Lucia, dressed as a green Martian, sips a frozen green tea drink while taking a break on the first day of the Comic-Con International convention in San Diego. The country's biggest comic book convention, Comic-Con, is set to open Thursday, July 24, 2008, in San Diego.