A behind-the-scenes look at the fans who gather by the thousands each year in San Diego, California to attend Comic-Con, the world's largest comic book convention.A behind-the-scenes look at the fans who gather by the thousands each year in San Diego, California to attend Comic-Con, the world's largest comic book convention.A behind-the-scenes look at the fans who gather by the thousands each year in San Diego, California to attend Comic-Con, the world's largest comic book convention.