Board Thread:General Discussion/@comment-43505-20161008233233/@comment-1013969-20161010182907

The only problem I see is Earth-E (effectively Earth-216 or Earth-154). Mark Gruenwald in Omniverse #1, 1977 putout a chard of how Earth-Two, Earth-E, and Earth-One differed that someone converted to text ([]):

Earth-2 Superman Rocket lands in 1920 Kal-El is a few months old Raised by John & Mary Kent No Superboy career Former reporter,now editor of Daily Star Married Lois in 1949 No Children Semi-retired from crimefighting Cousin-Powergirl No Children Luthor has red hair JSA member

Superman Earth-E Rocket lands in 1930 Kal-El is a 2 years old Raised by Johnathon & Martha Kent Superboy career Is a reporter for the Daily Planet Married Lois in 1960 Son:Clark Kent Jr Still active as a crimefighting No Cousin on Earth Kryptonite present Luthor is bald and older No group affiliation

"Between the Earth-Two Superman and Batman whose careers began in the 1940s and the Earth-One Superman and Batman whose careers began in the 1960s, there must have been a Superman and Batman whose careers began in the 1950s. In scanning the complete runs of all the magazines where Superman and Batman regularly appeared, is it difficult to assign strict cut-off points where one Earth's heroes' adventures end and the next begins.  Still, let us presume that the period between the retirement of the Justice Society (All-Star #57, February-March 1951) and the founding of the Justice League (Brave & Bold #28, February-March 1960) roughly corresponds to the heyday of the Earth-E heroes.

"The 'E' stand for both 'Extraneous' and 'E.' Nelson Bridwell, who first postulated the existence of this 'middle' Earth.""

The Fleischer Superman cartoons seem to take place on yet another Earth as there Superman can be active in Japan during WWII...which thanks to the Holy Grail the Earth-Two version couldn't have done.