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Klingon-Cardassian Alliance
Emblem image.
Dominant species: Klingons, Cardassians
Location: Alpha and Beta Quadrants
Capital: Qo'noS, Cardassia Prime
Sovereignty: 2295
System of government: Coalition
Head of government: Regent

In the mirror universe, the Klingon-Cardassian Alliance was a coalition government formed by the Klingon Empire and the Cardassian Union in 2295 as a counter to the Terran Republic, the short-lived successor state of the Terran Empire, as neither power alone possessed the strength of arms to defeat the Imperial Starfleet. The key to such an alliance between these two nations was the Republic of Bajor, whose role as a power-broker ensured a level of equality that otherwise would not have been able to exist. The Alliance defeated and conquered the Terran Empire, already weakened by the reforms of Terran Emperor Spock, and condemned all non-Alliance races and cultures to slavery. (DS9 episode: "Crossover")


The Alliance was created in 2295 by Regent Gorkon and Legate Renar following the Khitomer conference after attempts by the Klingon Empire to ally itself with the Terran Empire were rejected by Emperor Spock. The Praxis Disaster had left the Klingons crippled economically to the point where they could no longer conquer the Terrans single handedly and so needed a partner. In 2295, the Alliance conquered the Terran Republic using a fleet of Klingon Birds-of-Prey which could fire while cloaked. (TOS - Mirror Universe novel: The Sorrows of Empire) By the 2370s decade, the Alliance was the dominant power in the Alpha and Beta Quadrant region. The Alliance suffered a setback in 2370 when the Terran Rebellion was formed by Benjamin Sisko. The rebellion continued to be a problem for the Alliance, successfully gaining and holding Terok Nor in 2372 and capturing Regent Worf in 2375. (DS9 episodes: "Through the Looking Glass", "Shattered Mirror", "The Emperor's New Cloak")

The Alliance came close to defeat in 2371 when a Borg ship entered Klingon space on a course for Qo'noS, a fleet comprising of Klingon, Cardassian, Bajoran and Ferengi ships failed to stop the Borg, however, the timely arrival of Jean-Luc Picard with an Iconian probe which infected the Borg ship, destroying it, and saved the Alliance from assimilation. (TNG - Mirror Universe novella: The Worst of Both Worlds)

Within the Alliance, the Klingons held more political and military influence due to their empire being the more powerful at the time of the Alliance's formation, many Cardassians were unhappy with the smaller influence they held and members of their government, such as Supreme Legate Skrain Dukat worked to increase Cardassia's power by gathering support with Bajor, the other influential member in the Alliance. Following the capture of Worf by the Terran Rebellion in 2375, Martok succeeded him as Regent. In that year, the Alliance scored a major victory over the Terran rebellion when they destroyed the Empok Nor shipyard and the 12 Defiant-class warships being built there. A Romulan cloaking device was also captured. (DS9 - Mirror Universe novella: Saturn's Children)

Destiny timeline[]

The Alliance continued to struggle with the increased might of the Terran Rebellion, and eventually the two organizations signed an armistice. Formerly Alliance-occupied worlds, such as Earth, were liberated from Alliance control. Furthermore, a neutral zone was established which kept the newly formed Galactic Commonwealth safe from the Alliance. The Alliance was officially dissolved in 2380. (ST - Mirror Universe novel: Rise Like Lions)

Online timeline[]

The Alliance continued to fight the resurgent Terran Empire at least as late as 2409. In that year a prime universe Starfleet vessel crossed into the mirror universe to retrieve the Orb of Possibilities from a Terran installation in the Arawath system and end an attempted inter-universal invasion by the Empire. Alliance forces under General B'Vat and Captain Ja'rod offered the Starfleet captain assistance against their common enemy, and aided in the success of the operation. (STO mission: "The Other Side")

The Mirror Universe Trilogy[]

In another permutation of the mirror universe, the Alliance was forged by Emperor Tiberius to conquer the Terran Empire following his ousting by his Prime Minister, Spock. No one else had thought that pairing possible, for while it was in the Cardassian nature to seek alliances, it was not a common Klingon trait, except under exceptional circumstances. In 2375 agents of the Alliance began replacing members of Starfleet and stealing designs of Federation starships in retaliation of what they believed was the Federation aiding the Terran Rebellion of their own universe through their possession of a Defiant-class ship. The Alliance's plans were foiled when Tiberius' agents compromised their operations in the Goldin Discontinuity. (ST - Mirror Universe Trilogy novel: Spectre)

Alternate timelines[]

Dark Mirror[]

In another permutation of the mirror universe in which the Terran Empire survived well into the 24th century, the Alliance never existed and the Klingons had been conquered by the Terrans prior to 2367. (TNG novel: Dark Mirror)

25th century[]

In another permutation, the Terran Empire was reborn from the Terran Rebellion, and fought the KCA. In 2409, Admiral Leeta claimed the Empire had conquered everyone else in their reality. (STO mission: "Counterpoint")

In a distinct version of that timeline, Captain James O'Brien led the reborn Terran Empire into an invasion of the prime universe, while Imperial Starfleet still fought KCA ships and troops at Arawath in 2409. (STO mission: "The Other Side")

Q's temporal crisis[]

As a result of the temporal anomaly crisis Q was involved in, forces of the KCA were transported into the temporally disorganised Alpha and Beta Quadrant of the prime universe. Regent Worf initially landed troops on Vulcan to avenge Emperor Spock's crimes. Federation Starfleet liberated the planet and made peace with the KCA. The KCA setted on planet Eden and sought diplomatic relations with neighboring powers. Relations with the Romulan Star Empire and Klingon Empire were uneasy at best. (ST video game: Star Trek Timelines)


Officers and soldiers of the Alliance

The military of the Alliance is made up of officers and soldiers of the Klingons, the Cardassians and the Bajorans. However, each clearly has the official enblem of the Alliance on their uniforms. Their weapons and uniforms are similar to those of "our" universe. The Bajorans wear in the mirror universe, a much darker and more pronounced military uniforms. Their main role is mainly in the task, the captured Terrans to monitor and ensure that their objectives are achieved without opposition. In disobedience they are just like their former Terran counterparts ruthlessly deal with those affected.

An Alliance fleet

The ships are available to them, at least in design and function the same as those of our universe. They are usually used for the individual sectors to protect the Alliance.

Hierachy of the Alliance[]


The regent was usually the supreme commander of the Alliance. There are usually two regents, one for Cardassians and the other for the Klingons. The Cardassian regent usually acts as a governmental unit, while the Klingon regent governs the military, and any combative action. Here are several known regents:


Intendant Kira in 2371

Since the regent could not personally oversee every single sector within their regency, intendants were delegated to oversee each specific sector or, sometimes, a single planet.

Here are several known intendants:


States in the mirror universe
treaty of alliance and mutual defense Galactic CommonwealthRomulan Star Empire
Taurus Pact Breen ConfederacyGorn HegemonyTholian AssemblyTzenkethi Coalition
non-aligned states Borg CollectiveCardassian UnionDominionFerengi AllianceGrigariKazon-OglaKinshayaKlingon EmpireTalarian RepublicThallonian Empire
defunct states Klingon-Cardassian AllianceTerran EmpireTerran RepublicTerran RebellionTerran Protectorate