An attendee dressed as Bill Cipher arrives for opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ2P2

Fans of superhero movies, comic books and pop culture arrive in costume for opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ2SG

A costumed attendee looks at her mobile phone during opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ3IN

Attendee Stacy Hunter of Temecula poses with Rugrats characters while on the convention floor during opening day of Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ3JO

Fans of superhero movies, comic books and pop culture walk the convention floor in costume during opening day of Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ3M7

An attendee dressed as the Scarecrow from Batman poses for a picture at the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9P2

An attendee keeps tabs on her cell phone as she walks the convention floor at the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9QH

Masks are shown for sale on the convention floor at the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9SK

Fans of superhero movies, comic books and pop culture arrive in costume for opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ2SD

A San Diego police officer takes a second look at an attendee's Star Wars Tusken Raider costume while patrolling the convention floor during opening day of Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ3IC

Gina Gianni of Chicago comes dressed as an animated Batgirl as she waits in a crowd to cross the street to attend the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9OX

Attendees dressed as Harley Quinn (L) and Sailor Moon pose for a picture at the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9RM

Em Blackburn from Atlanta, Georgia arrives dressed as Harley Quinn for opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ2OV

An attendee dressed as Harley Quinn arrives for opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ2SK

Fans of superhero movies, comic books and pop culture walk the convention floor in costume during the opening day of Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ3KB

An attendee dressed as Boba Fett from Star Wars rushes his way at the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9PP

Alex Kapelski of Ohio comes dressed as a bird to the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9SZ

Attendees gather for the start of Comic-Con International in San Diego, California, United States, July 20, 2016. REUTERS/Mike Blake - RTSIXYL

An attendee dressed as Batman enters as fans of superhero movies, comic books and pop culture arrive in costume for the first day of the 36th annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ2SH

Costumed attendees wearing SpongeBob SquarePants character masks pose on the convention floor during opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ3KU

Linda Nguyen comes dressed as the Disney character Maleficent poses as she attends the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9PO

Karen Ward and Samantha Ward dressed as characters from "Homestruck" attend the opening day of Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ3L4

Fans of superhero movies, comic books and pop culture arrive in costume for opening day of the annual Comic-Con International in San Diego, California, United States July 21, 2016. REUTERS/Mike Blake - RTSJ2R4

Leah Thomas, dressed as the character Diva Plavalaguna from The Fifth Element movie, poses for a picture as she attends opening day Comic-Con International in San Diego, California, U.S. July 21, 2016. REUTERS/Mike Blake TPX IMAGES OF THE DAY - RTSJ3G4

A young boy looks unimpressed as his father asks to take a picture with an attendee dressed as a Transformer at the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9Q2

Joe Phillips of San Diego dresses as his own version of a Star Wars character at the pop culture event Comic-Con International in San Diego, California, United States July 22, 2016. REUTERS/Mike Blake - RTSJ9U3