Prime Earth, also known as Earth O, was formed by the temporal merging of the disparate DC, Vertigo, and Wildstorm Universes in an effort by Pandora and the Flash to restore the timeline to its intended nature in the aftermath of the Flashpoint event, though it was later revealed that Doctor Manhattan used the cosmic upheaval to remove ten years from the continuity and cause the birth of the new reality inside a whole new Multiverse.

In this newly made universe, costumed crime-fighters were a relatively new phenomenon, with Superman being the first super-powered hero to come to public knowledge. Since then, several other heroes came to the fore, with the formation of the Justice League after the evil New God Darkseid attempted an invasion of Earth. The success of the Justice League's activities inspired the United Nations to create the government-sponsored team Justice League International.

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