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The STAR TREK Expanded Universe, the wiki encyclopedia for Star Trekfanworks and fan productions! ——— There are 15,713 articles on this wiki. ——— Warning: This wiki contains spoilers.
The "mirror universe" is the informal name for a parallel universe, so named because many people and places are "opposites" of their counterparts in "our" universe, with "evil" replacing good and vice versa.
The history of the mirror universe during the 22nd to the 24th century has been shaped largely due to influence from the "primary" universe.