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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)

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 Alliance had been 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

In a 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: Timelines)

First Splinter 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)



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
major states in the Alpha and Beta Quadrants
Khitomer Accords Cardassian UnionFerengi AllianceKlingon EmpireUnited Federation of Planets
Typhon Pact Breen ConfederacyGorn HegemonyHoly Order of the KinshayaRomulan Star EmpireTholian AssemblyTzenkethi Coalition
Khitomer Alliance Cardassian UnionDeferiDelta AllianceDominionFerengi AllianceKlingon EmpireLukari ConcordiumRomulan RepublicUnited Federation of PlanetsVoth Separatists
non-aligned states CortDaa'Vit ConfederacyDanteri EmpireFirst FederationGottar HegemonyGrigariHydran KingdomImperial Klingon StatesInterstellar ConcordiumJibetian ConfederacyKarg EmpireKentari UnionKzinti PatriarchyLyran Star EmpireMentosh AssemblyMetron ConsortiumNew Thallonian ProtectorateNyberrite AllianceOrion ColoniesPatriarchyRegnancy of the Carnelian ThroneSattar CollectiveSheliak CorporateShirn AllianceTalarian RepublicTarn EmpireTezwaTirrion AssemblyUbarrak PrimacyVenette ConventionVomnin Confederacy
defunct states Hiram AssemblyHradrian EmpireHusnock Star KingdomImperial Romulan StatePartnership of CivilizationsStellar Kingdom of CorillThallonian EmpireThelasian Trading ConfederacyZalkat Union
states unique to the mirror universe Galactic CommonwealthKlingon-Cardassian AllianceTerran EmpireTerran Republic
states from other alternate timelines AllianceErdenreichGalactic UnionIconian-Dominion AllianceInterstellar AxisInterstellar CoalitionInterstellar UnionKlingon-Andorian CompactVulcan-Andorian EmpireVulcan ProtectorateVulcan Star Empire

External links