Comic-Con is the largest annual gathering of fans of the comic book, sci-fi and fantasy genres, drawing around 130,000 people over four days, and has become a major battleground for moviemakers.
Anything which is sci-fi, fantasy or superhero-based, it's certain to be represented somewhere on the convention center's sprawling floor space.
This year, studios brought some A-list surprises to the geeky festival to promote upcoming superhero blockbusters. In recent years the convention has seen more and more content showcased as studios fight to capture the attention of fans.
20th Century Fox delivered the biggest surprise, presenting the heavyweight stars of "X-Men: Days of Future Past," including Jennifer Lawrence, Hugh Jackman, Halle Berry, Patrick Stewart and Ian McKellan to an exuberant 6,000-plus crowd.
Here are some images from the four-day festival of pop culture attended by lots and lots of devotees of comic books, movies and TV shows, mostly dressed in the costumes of their idols.