Primal Earth
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Overview
Primal Earth is the name that Portal Corporation, founded by Dr. Brian Webb, uses to refer to the dimension that Paragon City and the Rogue Isles originate in, and where the game worlds of City of Heroes and City of Villains are based. Tina Macintyre is Primal Earth's foremost Portal Corps researcher at the moment.
Most folks in this dimension just refer to it as Earth. However, Portal Corps has encountered in excess of twenty different dimensions through their portal technology. Therefore, it is necessary to differentiate between the different "worlds" (dimensions).
Dimension Differences
Each dimension has its own timeline, where past events may or may not have happened, and if they did happen, the outcome may have been different.
For instance, Praetoria (the dimension that Going Rogue will be based) is under the rule of Emperor Cole, also known as Tyrant, the Praetorian version of Primal Earth's Statesman. Other heroes are known to have Praetorian versions of themselves; it is not known yet whether the Signature Villains have alternate versions, but it is assumed so. Note that Portal Corporation scientifically refers to this dimension as Upsilon Beta 9-6.
Various other difference may or may not be immediately obvious between the worlds.