A man dressed as Ironman takes a seat in the cafeteria on the second day of the London Super Comic Convention at the ExCel centre in east London, on March 15, 2015. (Photo by Justin Tallis/AFP Photo)

Maisy Minx dressed as Harley Quinn from the Batman comic book poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Mojo Jones dressed as Black Cat from Marvel comic book poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Maria Grozova dressed as Alana from Saga comic book poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Tori Seager dressed as Harley Quinn from the Batman comic book poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Adam Richards dressed as The Joker from the Batman comic book poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Ricky Santiago dressed as Deadpool from the Marvel comic book poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Eilidh Duff dressed as Gamora from the Guardians of the galaxy poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Kyle Nicholson dressed as Reptile from Mortal Kombat poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Gal Leicht dressed as a member of the Court of the Owls from Batman poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Brice Jones dressed as Black Mask from Batman poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)

Dante Hart dressed as Two Face from Batman poses for a photograph at the London supercomic convention at the Excel centre, east London, March 14, 2015. (Photo by Paul Hackett/Reuters)