In DC Comics, an earth in a paralell uinverse. It's the original home of the Golden Age Superheroes like Jay Garrick The Flash, Alan Scott Sentinel and the JSA. They all now reside one Earth-Only.

Before Crisis on Infinite Earths, Earth-Two was used to keep the Golden Age heroes seperate from the Silver Age heroes.

Not to be confused with Earth2, the Anti-Matter Earth (known as Earth-Four before the Crisis on Infinite Earths)

The concept was originally formulated by DC editor Julius Schwartz and writer Gardner Fox and introduced in Flash #123, "Flash of Two Worlds", in which the Golden Age and Silver Age versions of the Flash fought side by side. The Golden Age Flash appeared again in issue #129, and the entire Justice Society of America appeared in issue #137.

The JSA and the Justice League of America then teamed up in JLA #21-22. It was then that the terms Earth-1 (for the Justice League's world) and Earth-2 (for the parallel world the Golden Age heroes inhabited) were introduced.

See also Earth-1, Earth-3, Earth-S, Earth-X, and Earth Prime.

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