justice league mera amber heard Justice League: Amber Heard as Mera Revealed Even though fans are still a few years away from seeing Jason Momoa and director James Wan bring Aquaman to the big screen, the character has already made a brief appearance in the DCEU. Momoa got his first chance to play the king of Atlantis in Batman V Superman: Dawn of Justice, but is set to have a much larger role in Justice League. Now, fans can get their first official look at Heard in costume.