Star Trek Expanded Universe
Terran Empire
Emblem of The Terran Empire
Form: Authoritarianism
Location: Mirror universe
Major Species: Terrans
Military: Imperial Starfleet
"To conquer the galaxy for the glory of the Empire"
— Imperial Starfleet Motto

The Terran Empire was a repressive Terran-dominated government and mirror universe counterpart of the United Federation of Planets. (Star Trek: The Original Series, Star Trek: Deep Space Nine, Star Trek: Enterprise)


While in the mirror universe, after being accidentally transported there, James T. Kirk was under orders to annihilate the Halkans, who refused to allow the Empire to mine their dilithium. The Halkans feared it would be used for the Empire's war capabilities, and they warned that one day the Empire's brutal policies would lead to its collapse in a devastating civil war. Soon, the mirror universe Spock came under orders to assassinate Kirk if he did not comply within a few hours. Spock warned Kirk of those orders, and, realizing Spock was a man of integrity in both universes, Kirk saw in Spock a chance to reform the Empire and try to avert its predicted collapse. Before returning to his own universe Kirk urged Spock to steer the Empire and the mirror universe toward a more civilized state. Spock said he would “consider it.” (TOS: "Mirror, Mirror")

Unknown to the Federation, another contact occurred a century earlier from the Empire's perspective, when the Tholians detonated a tricobalt device, creating an interphase between the two universes. (ENT: "In a Mirror, Darkly")

It was learned a century later that Spock did more than consider it, but whether he brought civilization to the Empire that universe remained as violent and barbaric as ever. It was related to Kira Nerys by her mirror counterpart that Spock had apparently disarmed the Empire and left it vulnerable to conquest by an alliance of Klingons and Cardassians, and that humans and Vulcans had become slaves. (DS9: "Crossover")

Dark Mirror timeline[]

A few years after Spock began effecting some changes, Spock was set up on treason charges and executed before he could reform the Empire, which had wiped out the Romulan race and conquered the Klingons. (TNG novel: Dark Mirror)

This empire was never conquered by the Klingon-Cardassian Alliance.


Star Trek: Odyssey[]

As in the Dark Mirror timeline, this Terran Empire is from another parallel universe where they were never conquered by the Alliance.

Spock's new vision of reform only lasted until his own Captain Kirk returned to the mirror universe. The mirror Kirk, realizing he had been in another universe and the Empire could conquer that one as well, had Spock killed for his ideas and later became Emperor himself.

This particular version of the Terran Empire would not make any more contact with their Federation counterparts until 2380 when Counselor Christine Nycz was sent on a mission to the other side aboard USS Alexandria to kidnap Lieutenant commander Dustin Zofchak for information he possessed about the transphasic torpedo. They wanted the transphasic torpedo so they could deal with their own Borg problem.

During Zofchak's torture interrogation, he coined the phrase "Mirror Universe" to describe the other side; the mirror Captain Allensworth even liked the phrase enough to start using it himself. ("Objects in the Rear View Mirror")

The Terran Empire started the war with the Dominion and took control of the Dominion. However, unlike the Federation, the Empire did not send Voyager into the Badlands. As there was no reason to send them, Voyager remained in the Alpha Quadrant and there was no contact with any Delta Quadrant species other than the Borg.

With the transphasic torpedo in their hands, the Terran Empire took the fight to the Borg and eradicated the Borg Collective. Outposts were then set up in the Delta Quadrant to have a foothold in that area of space.

On stardate 57645.8, forces from the Terran Empire made their way into Federation space in the Talos star system. A battle ensued with both versions of the Alexandria going head to head. Due to the existence of the battle, the Mirror War between the Federation and the Terran Empire had officially begun. ("Advent")

The Empire gained its first foothold in Federation space by landing ground troops, led by Admiral Kathryn Janeway, on the Ba'ku planet. The assault lasted a few weeks before they were thwarted back into their own universe. ("Requiem") Other planets the empire had occupied were Betazed ("Where Angels Fear to Tread") and Cestus III. ("Catalyst of Sorrows") An undercover Commander Merriell was able to get the defense codes and transmit them to Voyager, where they were able to defeat the imperial forces and push them off the planet.

The Empire then came up with the plan to kill Captain Kirk during the Khitomer crisis using the Guardian of Forever, but this plan was stopped when Captain Allensworth, Commander Merriell and Lieutenant Commander Zofchak went back as well and prevented the assassination. ("Held in the Hands of Forever")

The mirror Tuvok traveled to the primary universe and gave the Federation information pertaining to the date when the empire planned to attack Earth. ("Ghosts of Tomorrow")

The empire attacked Earth to find a fleet of Federation starships waiting for them, however, the empire still had the advantage. That was until the USS Alexandria-A showed up with more starships as well as Klingon and Romulan ships. Unknown to the empire, the Federation had sent four fleets to the mirror universe to attack the mirror Earth and take the Emperor and Empress prisoner. The Emperor accepted defeat and officially declared the Mirror War was now over and the Federation had won. ("Where Mortals Are Forbidden")

Star Trek: Remington[]

The alternate mirror universe counterpart of the Terran Empire encountered by the crew of the USS Gustav P. Remington was the Third Terran Dominion.

One Good Man[]

Some time in 2293, after the events of Khitomer Conference, the USS Enterprise-A encountered the mirror universe version of Khan Noonien Singh, "the most wanted man in the Terran Empire for most of its history," who briefly mistakes them for their counterparts.

Before In a Mirror, Darkly[]

The Terran Empire gained its technology from a Vulcan ship that, according to Sergeant Travis Mayweather, was part of an invasion force. The Empire established control over more advanced worlds such as Vulcan, Andoria, and Tellar by backing various groups such as the Syrrannites. It claimed its aim was to bring order to a chaotic region of space.

The Empire included some worlds that used money. Starfleet conscripts from these worlds were paid.

Any alien who swore allegiance to the Empire automatically came under its protection and was considered a provisional citizen. For example, ISS Enterprise (NX-01) fought and captured a Vissian ship after liberating a cogenitor from the Vissians.

Following the Xindi attack on Earth in 2153, the Terran Empire put its core alien worlds into lockdown, including Denobula. On some worlds, such as Vulcan, Terran rule had been loose and most aliens may never have seen a Terran at all. Afterwards, control was tightened, and even privileged groups like the Syrrannites found they had no immunity from the tightened regime. The harsher regime led some dissident groups to take advantage of the confusion on Earth to launch a rebellion. When Enterprise returned from the Delphic Expanse, it led the 10 new NX-class starships to put down this new threat.

T'Les, the mother of T'Pol, speculated that the prime emotion driving the Terran Empire was not arrogance or greed, but fear of aliens and fear of another world war on Earth.

Star Trek Continues[]

After overthrowing Kirk, Spock broke the ISS Enterprise (NCC-1701) off from the Empire's control. Spock believed that the Halkans were correct in predicting the Empire's fall if reform did not come about. For example, the Andorians had rebelled against the Empire after three of its Kumari-class cruisers witnessed the extermination of the Halkans by the Enterprise. (Star Trek Continues: "Fairest Of Them All")

See also[]

External links[]