AP Photo/Denis Poroy
Costumed fans are seen outside the San Diego Convention Center during the first day of Comic-Con 2011, July 21, 2011, in San Diego.
AP Photo/Gregory Bull
Nathan Patta, left, and Jackson Noye pose for pictures dressed as Captain America during the first day of Comic-Con 2011, July 21, 2011, in San Diego.
AP Photo/Denis Poroy
A fan dressed as "The Joker" from the Batman films and comics, is seen outside the San Diego Convention Center during the first day of Comic-Con 2011, July 21, 2011, in San Diego.
AP Photo/Gregory Bull
Jeff Cho, a Navy officer stationed in San Diego, adjusts his Captain America outfit before a screening of the movie, "Captain America: The First Avenger," during the first day of Comic-Con 2011, July 21, 2011, in San Diego.
Jerod Harris/Getty Images
Two costumed fans wait in front of a Comic-Con banner before Preview Night at the Comic-Con 2011 convention on July 20, 2011, in San Diego.
AP Photo/Denis Poroy
Tracy Ho and Demir Oral pose as they ride the escalator during Preview Night at the Comic-Con 2011 convention on July 20, 2011, in San Diego.
Jerod Harris/Getty Images
Michael Calabrese and his son, Jacob, relax on the floor during Preview Night at the Comic-Con 2011 convention on July 20, 2011, in San Diego.
Jerod Harris/Getty Images
Patrick Vargas, of Chula Vista, Calif., during Preview Night at the Comic-Con 2011 convention on July 20, 2011, in San Diego.
