Wonder Woman is the superhero name given to Diana of Themyscira, an Amazonian Princess from Paradise Island. In the future, she becomes one of the world's greatest heroes as well as (along with Superman and Batman) one of the founding members of the Justice League of America. However, it's apparent that Diana/Wonder Woman is a part of the Smallville universe as Chloe Sullivan mentions meeting "a wonderous woman who will throw you (Clark) for a loop" while meeting heroes around the world.