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The Bajoran city of Hathon as it appears in the Mirror Universe

Terok Nor and Leeta as they appear in the Mirror Universe

Mirror universe is the unofficial designation for the parallel universe the Terran Empire and the Klingon-Cardassian Alliance originate from. In contrast to the "prime" universe, the course of history has taken a different turn early in Earth's history (and possibly other planets as well). Humanity has not risen to be a respected member in an interstellar alliance of equals, but a totalitarian regime oppressing other races by brutal force.


For further information, see Terran Empire and Klingon-Cardassian Alliance.

No date of divergence between the Prime timeline and the Mirror universe has been established, although it is likely it dates back to the 16th century, if there is one, with the Terran Empire dating back to at least the 20th century.

Humanity's First Contact with an alien race still took place with the Vulcans in 2063, although in this timeline Zefram Cochrane shot the Vulcans and the humans seized the Vulcan ship and its technology. The Terran empire rapidly spread across the stars, conquering Vulcan, Andoria, Tellar Prime, Bajor Denobula, and Gorlan by the 22nd century.

Humanity's conquered races began rebelling against the Empire, but its rule was saved by the displaced U.S.S. Defiant, from the Prime Universe's 23rd century. Using the advanced technology from the future, the Empire was able to conquer all of known space, including rendering Qo'noS uninhabitable.

In 2256, the U.S.S. Discovery and I.S.S. Discovery swapped places, although the I.S.S. Discovery (along with a small Klingon fleet) was also displaced in time, sending it to 2410. It was returned to 2256, in the prime universe, shortly before it was destroyed by Klingons; however her captain remained at large in 2410.

In 2267, a transporter accident swapped James T. Kirk with his counterpart. The influence of the Prime Universe Kirk on the Mirror Universe Spock led to Spock taking control of the Empire and reforming it to peaceful and benevolent. This however led to a weakening of the empire and allowed the Klingon-Cardassian Alliance to rise to challenge it. The Klingon-Cardassian Alliance eventually conquers the entire Empire by the mid-24th century with the former Terran rulers reduced to slaves. Bajor later joins the Alliance.

Over the 2370s, people from the prime universe make a number of "crossovers" between the realities and begin a chain of events that lead to the Terran slaves of Terok Nor rebelling against the Alliance and re-take Terok Nor. The Rebellion manages to steal the plans for the U.S.S. Defiant and construct the I.S.S. Defiant. Combined with a stolen Klingon cloaking device, the Terrans manage to fight off Alliance forces.

By the 25th century, the Alliance has fallen to a newly reformed Terran Empire. It is as totalitarian as before and, while it allows non-Terrans such as Leeta to serve in its ranks, it still maintains a highly xenophobic attitude towards them and outsiders. It also begins incursions into the Prime Universe, forging an alliance with the True Way. The Orb of Possibilities, taken from the mirror universe at an unknown time, is returned to mirror Bajor, aiding the rise of Captain Leeta.

In 2410, the Mirror Universe's history is altered significantly when Admiral Leeta defeats the Iconians 200,000 years in the past and takes challenges the Emperor's power using a combination of future technology from the Temporal Liberation Front and aid from the Pah-wraith.

In 2411, the Terran Empire in the Mirror Universe has further expanded their diversity with Kuumaarke, a Lukari captain, and an Alliance captain, serving their ranks.

Missions visited[]

Missions involved[]

See Terran Empire#Missions involved


External links[]


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Terran Empire
Faction Terran Empire.png
Details Terran EmpireImperial Starfleet • TerranMirror Universe • Badlands • Badlands Battlezone • Bajor • Empok Nor • Terok Nor • Klingon Alliance Base • Terran Empire Base • Terran Task Force
Ground Forces Mirror Chief • Terran Ensign Engineering Officer • Terran Ensign Medic • Terran Ensign Tactical Officer • Terran Lieutenant Engineering Officer • Terran Lieutenant Medic • Terran Lieutenant Tactical Officer
Starships Mobius Temporal Destroyer • Temporal Dreadnought • Terran Armitage Class Escort Carrier • Terran Chimera Heavy Destroyer • Terran Command Cruiser • Terran Cruiser • Terran Danube Runabout • Terran Escort • Terran Frigate • Terran Galaxy Class Cruiser • Terran Galaxy Dreadnought Cruiser • Terran Intrepid Class Science Vessel • Terran Multi-Mission Explorer • Terran Nebula Class Science Vessel • Terran Odyssey Dreadnought Cruiser • Terran Peregrine Fighter • Terran Prometheus Class Escort • Terran Rhode Island Science Vessel • Terran Science Vessel
NPCs Emperor • Leeta • Sylvia Tilly • Amna Patel • Rathmon • Gabriel Lorca • Player character
NPC starships I.S.S. Armitage • I.S.S. Battleship • I.S.S. Centaur • I.S.S. Cerberus • I.S.S. Charon • I.S.S. Dakota (Frigate) • I.S.S. Dakota (Cruiser) • I.S.S. Delaware • I.S.S. Devron • I.S.S. Discovery • I.S.S. Emissary • I.S.S. Enterprise • I.S.S. Excelsior • I.S.S. Exeter • I.S.S. Fortuna • I.S.S. Galaxy • I.S.S. Hermes • I.S.S. Hydaspes • I.S.S. Jupiter • I.S.S. Kirk • I.S.S. Liebig • I.S.S. London • I.S.S. Luna • I.S.S. Miranda • I.S.S. Molly • I.S.S. Monterey • I.S.S. Nova • I.S.S. O'Brien • I.S.S. Odyssey • I.S.S. Olympus • I.S.S. Quantum • I.S.S. Saber • I.S.S. Sato • I.S.S. ShiKahr • I.S.S. Sisko • I.S.S. Sovereign • I.S.S. Spock • I.S.S. Stadi • I.S.S. Star Treader • I.S.S. Trident • I.S.S. Typhoon • I.S.S. Venture • I.S.S. Vistula