Comic-Con, the annual confab of global geekdom now in its second day in San Diego, wouldn't be half as fun if fans didn't dress up.
Some go as their favorite movie, TV or comic-book character; others invent their own. The difference hardly matters. Cosplaying, as it is known, is a great way to see and be seen.
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Check out the gallery above for a selection of masked heroes and villains we found roaming the halls of the Convention Center on Day One -- and check back later for more visual feasts from the geekiest place on Earth.