LONDON (Reuters) - ?Game of Thrones? actor Jason Momoa brings the latest superhero spin-off to the big screen, this time ?Aquaman?, to tell the story of the DC Comics half-human, half-Atlantean character. The 39-year-old first made an appearance in the role in 2016?s ?Batman v Superman: Dawn of Justice? but now has his own movie exploring the superhero?s origins.