Earth-Two (pre-crisis)

Earth-Two (pre-crisis)

Multiverse characters: 

DC's Golden Age heroes, including the Justice Society of America, whose careers began at the dawn of World War II (concurrently with their first appearances in comics): chemistry student Jay Garrick as the Flash; radio engineer Alan Scott as Green Lantern; archaeologist Carter Hall as Hawkman; pint-sized powerhouse Al Pratt as the Atom; and Clark Kent (Kal-L), who began his career as Superman as an adult.

Notes: 

Politically, Earth-Two was different from the Earth-One template modeled after Earth-Prime. For example, Quebec was an independent nation autonomous from Canada, South Africa had abolished apartheid sooner and the Atlantean countries of Poseidonis and Tritonis were both ruled by a queen, not a king, their inhabitants displaying surface-dweller features and no capacity for underwater survival, as the Atlantis continent had been raised to the surface (the model was the Atlantis seen in Golden Age Wonder Woman stories).

First described as a distinct Earth in The Flash (vol. 1) #123 (September 1961), first named in Justice League of America (vol. 1) #21 (August 1963)

Hypertime version called Earth-2