Comic-Con took place over the weekend, and we're celebrating all the geeky fun. Both celebrities and cosplayers are a common sight at the event, and sometimes the two collide when a star decides to channel a famous character — be they a famous figure in geek culture or a character that they've played themselves. While Tom Hiddleston dressed up as his Avengers character Loki in 2013, Mark Ruffalo cleverly disguised himself with a mask at New York Comic-Con last year. Keep scrolling to see all the celebrities who not only showed up but dressed up!
— Additional reporting by Maria Mercedes Lara, Maggie Pehanick, and Kelsie Gibson