An attendee poses for a picture as they arrive in a costume to enjoy Comic Con International in San Diego, California, U.S., July 19, 2019. The annual event is celebrating its 50th anniversary this year. It started with 300 attendees in a basement at the US Grant Hotel in San Diego and has since grown to welcome nearly 150,000 paying guests. REUTERS/Mike Blake

Attendees in costumes pose for a picture on the convention floor as they enjoy Comic Con International in San Diego, California, U.S., July 19, 2019. The focus of the convention has also changed. What started out as a chance for comic fans to buy and sell issues and to meet the comics' creators has become something much bigger, and less comic-driven. REUTERS/Mike Blake

Attendees pose for a picture in costumes at Comic Con International in San Diego, California, U.S., July 19, 2019. REUTERS/Mike Blake

An attendee arrives in costume to enjoy Comic Con International in San Diego, California, U.S., July 19, 2019. REUTERS/Mike Blake

An attendee dressed as a Fortnite character poses for a picture in a costume at Comic Con International in San Diego, California, U.S., July 19, 2019. REUTERS/Mike Blake

Attendees pose for a picture in costumes at Comic Con International in San Diego, California, U.S., July 19, 2019. REUTERS/Mike Blake