Photos: Celebrity appearances at Comic-Con 2013

"The Big Bang Theory" stars Melissa Rauch and Johnny Galecki atop the Warner Bros. booth at Comic-Con. Running from Wednesday through Sunday, July 21, the event floods the San Diego Convention Center with more than 100,000 attendees as they shuffle between panels promising exclusive previews and answers to fans' burning questions. <a href='http://www.cnn.com/2013/07/18/us/gallery/comic-con-2013/index.html' target='_blank'>See more sights from Comic Con 2013</a>.

"The Big Bang Theory" stars Melissa Rauch and Johnny Galecki atop the Warner Bros. booth at Comic-Con. Running from Wednesday through Sunday, July 21, the event floods the San Diego Convention Center with more than 100,000 attendees as they shuffle between panels promising exclusive previews and answers to fans' burning questions. See more sights from Comic Con 2013.