Earth-E
From superman.nu: Supermanica
Earth-E
One of the countless Parallel-Worlds. On this parallel Earth, Superman and Batman both have Super-Sons named Superman, Jr. and Batman, Jr., respectively. The chronicles are unclear as to whether this Earth actually exists, it may represent a computer simulation, so as a result Earth-E might be considered a theoretical concept (WF No. 215, Dec 1972/Jan 1973: "Saga of the Super Sons!"; and others).
Unlike other Parallel-Worlds such as Earth-1, Earth-2, and others; the term "Earth-E" does not itself appear in any of the chronicles.
