Earth-One

The Earth-One universe is only relevant to the SuperFriends series in that it closely parallels the SuperFriends universe Earth-1A.

History
Earth-One was the designation for an Earth, and the Universe it inhabited, that existed prior to the 1985 series Crisis on Infinite Earths. Most of its adventures span from the mid 1950’s – thru the mid 1980’s. This would be true of its SuperFriends Counterpart, Earth-1A.

Inhabitants
DC’s Silver Age heroes resembled those of its primary counterpart, Earth-Two’s Golden-Age heroes. The two Earths were closely linked in terms of parallel development, although Earth-Two individuals usually predated their Earth-One counterparts by a few decades.


 * Some that were direct parallels to their predecessors including:
 * Superman (Earth-One) and Superman (Earth-Two)


 * Some less so:
 * Atom, Ray Palmer (Earth One) and Atom, Al Pratt (Earth-Two)
 * Barry Allen as the Flash (Earth One) and Jay Garrick, the Flash (Earth -Two)
 * Hawkman, Carter Hall (Earth One) and Hawkman, Katar Hol (Earth -Two) a Thanagarian
 * Hal Jordan as Green Lantern (Earth-One) and Alan Scott as Green Lantern (Earth-Two)

General Information
Of all the different universe, Earth-One was by far the most popular and widely explored and it retained dominance over the other four worlds which merged with it during the Crisis on Infinite Earths storyline. The DC Universe’s “official” continuity post-Crisis took place on a “merged” Earth-One, as the Crisis revealed that this universe had been the core reality until rogue Guardian Krona fractured reality at the dawn of creation, creating both the multiverse and the Antimatter universe.

First Appearance
At what point DC began chronicling the adventures of Earth-One heroes, rather than Earth-Two heroes, cannot be determined with certainty. There are too many characters and too many back stories to limit it to just a few years as most do, placing it in the mid-to-late 50’s.

Most feel comfortable with the story of the first travel to another parallel universe when The Flash (Barry Allen) accidentally changed his vibrational frequency to match that of Earth-Two, where he met Jay Garrick, the Golden Age Flash. That meeting resulted in years of interaction between the original super-hero team, The Justice Society of America, and their younger Earth-One counterparts, The Justice League of America. As Barry Allen was the first traveler, the honor of naming the two earths fell to him – his universe’s Earth was called Earth-One, Jay Garrick’s became Earth-Two. As noted years later by the elder Superman, they (the JSA) were too polite to mention that they were around first.