"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>.
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. See more sights from Comic Con 2013.
Chris Frawley/WBTV via Getty Images
Dan Harmon, center, creator and executive producer of "Community," is helped out of a costume by actors Jim Rash, left, and Danny Pudi during the "Community" panel on the final day of Comic-Con International on Sunday, July 21, in San Diego. 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>.
Celebrity appearances at Comic-Con 2013 —
Dan Harmon, center, creator and executive producer of "Community," is helped out of a costume by actors Jim Rash, left, and Danny Pudi during the "Community" panel on the final day of Comic-Con International on Sunday, July 21, in San Diego. 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.
Jordan Strauss/Invision/AP
Producer and actor Danny DeVito speaks onstage at the "It's Always Sunny in Philadelphia" Q&A on July 21.
Celebrity appearances at Comic-Con 2013 —
Producer and actor Danny DeVito speaks onstage at the "It's Always Sunny in Philadelphia" Q&A on July 21.
Albert L. Ortega/Getty Image
Actor Charlie Hunnam speaks onstage at the "Sons of Anarchy" panel on July 21.
Celebrity appearances at Comic-Con 2013 —
Actor Charlie Hunnam speaks onstage at the "Sons of Anarchy" panel on July 21.
Albert L. Ortega/Getty Images
Actress Ginnifer Goodwin attends Entertainment Weekly's Comic-Con Celebration at the Hard Rock Hotel on Saturday, July 20.
Celebrity appearances at Comic-Con 2013 —
Actress Ginnifer Goodwin attends Entertainment Weekly's Comic-Con Celebration at the Hard Rock Hotel on Saturday, July 20.
John Shearer/Invision for Entertainment Weekly/AP
Hugh Jackman, from left, Patrick Stewart, Ian McKellen, Halle Berry and Anna Paquin speak at the 20th Century Fox panel on July 20.
Celebrity appearances at Comic-Con 2013 —
Hugh Jackman, from left, Patrick Stewart, Ian McKellen, Halle Berry and Anna Paquin speak at the 20th Century Fox panel on July 20.
Kevin Winter/Getty Images
Actor Jeff Bridges speaks onstage at the Warner Bros. and Legendary Pictures preview of "Seventh Son" on July 20.
Celebrity appearances at Comic-Con 2013 —
Actor Jeff Bridges speaks onstage at the Warner Bros. and Legendary Pictures preview of "Seventh Son" on July 20.
Albert L. Ortega/Getty Images
Actress Jennifer Lawrence attends Lionsgate's "The Hunger Games: Catching Fire" and "I, Frankenstein" press line on July 20.
Celebrity appearances at Comic-Con 2013 —
Actress Jennifer Lawrence attends Lionsgate's "The Hunger Games: Catching Fire" and "I, Frankenstein" press line on July 20.
Ethan Miller/Getty Image
Actor Bryan Cranston speaks onstage at the Warner Bros. and Legendary Pictures preview of "Godzilla" on July 20.
Celebrity appearances at Comic-Con 2013 —
Actor Bryan Cranston speaks onstage at the Warner Bros. and Legendary Pictures preview of "Godzilla" on July 20.
Kevin Winter/Getty Images
Actress Keri Russell attends the "Dawn of the Planet of the Apes" press line at Hilton San Diego Bayfront Hotel on July 20.
Celebrity appearances at Comic-Con 2013 —
Actress Keri Russell attends the "Dawn of the Planet of the Apes" press line at Hilton San Diego Bayfront Hotel on July 20.
Alberto E. Rodriguez/Getty Images
Donald Faison attends the Playboy and Universal Pictures' "Kick-Ass 2" event on Friday, July 19.
Celebrity appearances at Comic-Con 2013 —
Donald Faison attends the Playboy and Universal Pictures' "Kick-Ass 2" event on Friday, July 19.
Charley Gallay/Getty Images for Playboy
Co-creator/executive producer Seth Green poses with a fan at the "Robot Chicken" signing for the Comic-Con International 2013 in San Diego on Thursday, July 18.
Celebrity appearances at Comic-Con 2013 —
Co-creator/executive producer Seth Green poses with a fan at the "Robot Chicken" signing for the Comic-Con International 2013 in San Diego on Thursday, July 18.
Eddy Chen/CNN
Comic book icon Stan Lee attends his "World of Heroes" YouTube channel panel at the Hilton San Diego Bayfront Hotel on Friday, July 19. Lee's "World of Heroes" is a channel for all things related to the hero lifestyle and enthusiast culture according to the <a href="http://www.youtube.com/user/worldofheroes" target="_blank" target="_blank">"World of Heroes" YouTube channel.</a>
Celebrity appearances at Comic-Con 2013 —
Comic book icon Stan Lee attends his "World of Heroes" YouTube channel panel at the Hilton San Diego Bayfront Hotel on Friday, July 19. Lee's "World of Heroes" is a channel for all things related to the hero lifestyle and enthusiast culture according to the "World of Heroes" YouTube channel.
Ethan Miller/Getty Images
Gillian Anderson, left, and David Duchovny attend the 20th anniversary celebration of "The X-Files" with TV Guide Magazine at the San Diego Convention Center on Thursday, July 18.
Celebrity appearances at Comic-Con 2013 —
Gillian Anderson, left, and David Duchovny attend the 20th anniversary celebration of "The X-Files" with TV Guide Magazine at the San Diego Convention Center on Thursday, July 18.
Imeh Akpanudosen/Getty Images
Actor Norman Reedus spends his first day at the WIRED Cafe on July 18. Reedus plays fan favorite Daryl Dixon on the TV show "The Walking Dead."
Celebrity appearances at Comic-Con 2013 —
Actor Norman Reedus spends his first day at the WIRED Cafe on July 18. Reedus plays fan favorite Daryl Dixon on the TV show "The Walking Dead."
Michael Kovac/WireImage/Getty
From left, David Giuntoli ("Grimm"), Tyler Posey ("Teen Wolf"), Steven Yeun ("The Walking Dead"), Kit Harington ("Game of Thrones") and Matt Smith ("Doctor Who") appear at Entertainment Weekly's Brave New Warriors panel on July 18.
Celebrity appearances at Comic-Con 2013 —
From left, David Giuntoli ("Grimm"), Tyler Posey ("Teen Wolf"), Steven Yeun ("The Walking Dead"), Kit Harington ("Game of Thrones") and Matt Smith ("Doctor Who") appear at Entertainment Weekly's Brave New Warriors panel on July 18.
Daniel Knighton/ZUMAPRESS/Newscom
Actor Kit Harington spends the first day at The Samsung Galaxy Experience on July 18. Harington plays Jon Snow, the illegitimate son of Ned Stark on HBO's "Game of Thrones."
Celebrity appearances at Comic-Con 2013 —
Actor Kit Harington spends the first day at The Samsung Galaxy Experience on July 18. Harington plays Jon Snow, the illegitimate son of Ned Stark on HBO's "Game of Thrones."
Michael Buckner/Getty Images
Actors Meghan Ory, left, Josh Holloway and Marg Helgenberger speak onstage at the "Intelligence" panel at San Diego Convention Center<strong> </strong>on July 18. The sci-fi TV series is set to premiere in February.
Celebrity appearances at Comic-Con 2013 —
Actors Meghan Ory, left, Josh Holloway and Marg Helgenberger speak onstage at the "Intelligence" panel at San Diego Convention Center on July 18. The sci-fi TV series is set to premiere in February.
Albert L. Ortega/Getty Images
A masked Jack Black walks down the street as fans ask for his autograph on July 18.
Celebrity appearances at Comic-Con 2013 —
A masked Jack Black walks down the street as fans ask for his autograph on July 18.
Mark Davis/Getty Images
Actors William Shatner, left, Roseanne Barr and Wayne Knight speak onstage at Comedy Legends of TV Land at the Hilton San Diego Bayfront Hotel on July 18.
Celebrity appearances at Comic-Con 2013 —
Actors William Shatner, left, Roseanne Barr and Wayne Knight speak onstage at Comedy Legends of TV Land at the Hilton San Diego Bayfront Hotel on July 18.
Ethan Miller/Getty Images
Former Guns N' Roses guitarist Slash appears at the WIRED Cafe on July 18.
Celebrity appearances at Comic-Con 2013 —
Former Guns N' Roses guitarist Slash appears at the WIRED Cafe on July 18.
Michael Kovac/WireImage/Getty Images
Blake Anderson, left, Adam DeVine, Anders Holm and Kyle Newacheck attend Comedy Central's "Workaholics" press line at the Hilton San Diego Bayfront Hotel on July 18.
Celebrity appearances at Comic-Con 2013 —
Blake Anderson, left, Adam DeVine, Anders Holm and Kyle Newacheck attend Comedy Central's "Workaholics" press line at the Hilton San Diego Bayfront Hotel on July 18.
Jerod Harris/Getty Images
Actor Michael C. Hall speaks onstage at Showtime's "Dexter" panel at San Diego Convention Center on July 18. The final season of "Dexter" premieres June 30.
Celebrity appearances at Comic-Con 2013 —
Actor Michael C. Hall speaks onstage at Showtime's "Dexter" panel at San Diego Convention Center on July 18. The final season of "Dexter" premieres June 30.
Kevin Winter/Getty Images
Actor Harrison Ford attends the "Ender's Game" Comic-Con Press Line at San Diego Convention Center on July 18. Ford stars as Col. Hyrum Graff, a colonel in the International Fleet and the commandant of the Battle School in the movie due to debut November 1.
Celebrity appearances at Comic-Con 2013 —
Actor Harrison Ford attends the "Ender's Game" Comic-Con Press Line at San Diego Convention Center on July 18. Ford stars as Col. Hyrum Graff, a colonel in the International Fleet and the commandant of the Battle School in the movie due to debut November 1.
Joe Scarnici/Getty Images
Writer/actor Simon Pegg, left and actor Nick Frost attend IGN And Focus Features Party Presented By The World's End at Float at Hard Rock Hotel San Diego on July 18. The Simon Pegg and Nick Frost trilogy ("Shaun of the Dead," "Hot Fuzz") comes to an end with the movie "The World's End" in theaters on August 23.
Celebrity appearances at Comic-Con 2013 —
Writer/actor Simon Pegg, left and actor Nick Frost attend IGN And Focus Features Party Presented By The World's End at Float at Hard Rock Hotel San Diego on July 18. The Simon Pegg and Nick Frost trilogy ("Shaun of the Dead," "Hot Fuzz") comes to an end with the movie "The World's End" in theaters on August 23.
Jerod Harris/Getty Images
Director/writer Maggie Carey, left and cast of "The To Do List" Alia Shawkat, Aubrey Plaza, Johnny Simmons, and Rachel Bilson at the WIRED Cafe on July 18. The movie will be released on July 26.
Celebrity appearances at Comic-Con 2013 —
Director/writer Maggie Carey, left and cast of "The To Do List" Alia Shawkat, Aubrey Plaza, Johnny Simmons, and Rachel Bilson at the WIRED Cafe on July 18. The movie will be released on July 26.
Jonathan Leibson/WireImage/Getty Images
Sylvester Stallone and Arnold Schwarzenegger arrive at the "Escape Plan" premiere at the Reading Cinemas Gaslamp on July 18. "Escape Plan" will be out in theaters on October 18.
Celebrity appearances at Comic-Con 2013 —
Sylvester Stallone and Arnold Schwarzenegger arrive at the "Escape Plan" premiere at the Reading Cinemas Gaslamp on July 18. "Escape Plan" will be out in theaters on October 18.
Ethan Miller/Getty Images
Actor Jesse Heiman poses outside the event on July 18.
Celebrity appearances at Comic-Con 2013 —
Actor Jesse Heiman poses outside the event on July 18.
Ethan Miller/Getty Images
Patrick Warburton poses with fans during Adult Swim's "The Venture Bros." signing on July 18.
Celebrity appearances at Comic-Con 2013 —
Patrick Warburton poses with fans during Adult Swim's "The Venture Bros." signing on July 18.
Eddy Chen/CNN
Robert Kirkman, creator of "The Walking Dead" comic, attends the unveiling of "The Walking Dead" Zombie Survival Machine at the Future US Booth on Wednesday, July 17.
Celebrity appearances at Comic-Con 2013 —
Robert Kirkman, creator of "The Walking Dead" comic, attends the unveiling of "The Walking Dead" Zombie Survival Machine at the Future US Booth on Wednesday, July 17.
Jerod Harris/Getty Images
Actors Asa Butterfield and Hailee Steinfeld attend the "Ender's Game" Experience press preview night, sponsored by HGTV, at Martin Luther King Jr. Park on July 17. "Ender's Game" is based on the military science fiction novel by Orson Scott Card, and is set to debut on November 1.
Celebrity appearances at Comic-Con 2013 —
Actors Asa Butterfield and Hailee Steinfeld attend the "Ender's Game" Experience press preview night, sponsored by HGTV, at Martin Luther King Jr. Park on July 17. "Ender's Game" is based on the military science fiction novel by Orson Scott Card, and is set to debut on November 1.
Michael Buckner/Getty Images