Alternate mirror universe

The alternate mirror universe is one of several parallel realities next to what is commonly termed as the mirror universe where the Terran Empire was not destroyed by the Klingon-Cardassian Alliance in the late 23rd century.

A highly-organized resistance movement called the Maquis strongly-opposed the Terran Empire in the late 23rd century and for much of the 24th century. Made of Terrans, Romulans, Bajorans, Betazoids, Trills, Orions, Vulcans and other species who felt betrayed in some way by the Empire.

Early History
It is not clear if the mirror universe diverged from the regular universe at some point or always existed in tandem, mirroring events and peoples. If the two universes did diverge it was at a point many hundreds of years ago. Phlox noted that the "great works" of literature in both universes were roughly the same except that the regular universe characters were "weak and compassionate," with the exception of Shakespeare. The mirror Klingons culture has a basis of celebrating the victory of Molor over Kahless. In the mirror universe, first contact was slightly different. In 2063 first contact between Vulcans and Humans took place much as it did in the regular universe. However once the Vulcans landed, instead of welcoming them with open arms, Zefram Cochrane shot the first Vulcan to step onto "Terran" soil and the "Terrans" proceeded to raid the Vulcan ship. The gun used by Zefram Cochrane later would come into the possession of Jonathan Archer, who wondered what would have happened had Cochrane not "turned the tables on [the Vulcans'] invasion force."

22nd century
By the 22nd century with advanced Vulcan technology at their disposal and with the alliance of near dozens of equaly brutal alien races at their side the Terran Empire was an unstoppable force that had expanded and conquered other races, including the Vulcans, Andorians, Tellarites, Orions and Denobulans. However by the middle of the century the Empire had unknowinly "bitten off more then it could chew" as it were with the discovery of a powerful new alien species that was somewhat secretly encroashing in on and threatening Imperial territory.

In 2155, the NX-class ISS Enterprise, under the command of Captain Maximilian Forrest was the flagship of the Terran Empire's Starfleet. In January of that year, Commander Jonathan Archer mutinied against Forrest in order to take the ship into Tholian space to capture a Terran starship which the Tholians had obtained.

While the mutiny was ultimately unsuccessful, Captain Forrest had no choice but to continue the mission, since the ship's helm had been locked on auto-pilot. The Enterprise was later destroyed by Tholian ships, but not before Archer was able to take control of the advanced alien craft. Archer tried to use the USS Defiant in a seeming mad grab for power, intending to overthrow and replace the Emperor himself, but in the end Archer himself was betrayed and killed by Hoshi Sato, his own communications officer who declared herself Empress.

23rd century and 24th century
A highly-organized resistance movement called the Maquis strongly-opposed the Terran Empire in the late 23rd century and for much of the 24th century.