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Terran Empire insignia.

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.

During the 22nd century, the capture of USS Defiant, a Starfleet vessel from a hundred years in the future, helped to solidify the Terran Empire's grip on power and dominance over the quadrant. (ENT: "In a Mirror, Darkly", "In a Mirror, Darkly, Part II")

The chance interaction between Starfleet officers from the primary universe during the 23rd century, with their counterparts from the mirror, who eventually led to the downfall of the Terran Empire and the rise of the Klingon-Cardassian Alliance. (TOS: "Mirror, Mirror"; DS9: "Crossover")
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"Remember, I've read your ship's logs, Sandy. Believe me, you need a diplomatic officer. You and your crew operate with all the subtlety of a brick through a glass window."
— Lt. Commander Pell Ojana to Captain Donald Sandhurst, discussing Pell's posting to the USS Gibraltar. (Star Trek: Gibraltar: "Prophets and Loss")

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Latest fan films

Chasing The Infinite Sky (Jul 2016)
Star Trek: Horizon (Feb 2016)
Star Trek: Renegades (Aug 2015)
Prelude to Axanar (Aug 2014)

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