AT: "mu" In the mirror universe, the ISS Avenger (NX-09) was an NX class Starfleet starship for the Terran Empire. It had fought in the war with the rebellion of the 2150s, and was one of the several vessels destroyed by the USS Defiant during Jonathan Archer's power struggle for the throne of the Empire.
History
Avenger alongside the USS Defiant
The Avenger was constructed at Antares Ship Yards in the early-to-mid-22nd century. It was placed under the command of a Terran Starfleet captain, and, like the ISS Enterprise, under the jurisdiction of Admiral Black.
Avenger was assigned to an assault fleet by early 2155. It was the same fleet that the Enterprise was assigned to, and that the Defiant set a course to rendezvous with, not knowing that it would be all but destroyed when it finally arrived.
In early 2155, the Avenger was caught in an attack by rebels and suffered heavy damage until assisted by the Defiant. In a plan devised by Commander Archer, Admiral Black was executed and all Humans on the Avenger were brought on board the Defiant. All alien crew members (except for Phlox) were transferred to the Avenger. When Phlox sabotaged the Defiant with assistance from Soval, the Avenger attacked the vessel. When the sabotage was discovered, Commander Charles Tucker stopped Phlox and reactivated the ship's systems. The Defiant targeted the Avenger and destroyed it with all alien hands on board. (ENT: "In a Mirror, Darkly, Part II")
Technical information
Avenger was structurally similar to the NX-class ships, at least externally. Its bridge was similar in design to the previous ships of the class, along with its own launch bay. The ship, however, was only equipped with a single shuttlepod. Unlike Enterprise, the Avenger did not have a situation room, but instead had a wall with banks of computers.
Crew
There were at least four different species represented among the crew. This included Andorian, Orion, Terran and Vulcan members.
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Appendices
Background
The mission patch of the ISS Avenger
According to "In a Mirror, Darkly, Part II" writer Mike Sussman, the name of the ISS Avenger was an homage to the star destroyer Avenger from Star Wars Episode V: The Empire Strikes Back.
The Latin text on the patch ("Audentes Fortuna Imperii") means "The bold [are] the fortune of the Empire". It is obviously based on "Audentes Fortuna Iuvat" ("Fortune favors the bold"), the motto of the Columbia NX-02 of our universe, switching just one word. The intended translation may have been "The Empire [is] Bold [and] Fortunate". But that translation is incorrect. Fortunately it can be translated, grammatically and semantically correct, as "The bold [are] the fortune of the Empire".
The registry number "NX-09" implies that the Empire had built at least nine NX-class vessels by that time.
Apocrypha
In addition to the canon reference to this vessel, the video game Star Trek: Shattered Universe depicts a later ISS Avenger of the 2290s, appearing as a nemesis of the ISS Excelsior.
The Avenger NX-09 was also seen in the Star Trek: Legacy computer game as the name of one of the NX-class ships.