ISS Avenger (NX-09) is the flagship of Admiral Black. It commanded a destroyed fleet in action against the rebels of the Terran Empire in Star Trek's Mirror Universe. The ship's motto is Audentes Fortuna Imperii (the Empire is fortunate and bold). Admiral Black is a senior Starfleet flag officer, serving the Terran Empire in the Mirror Universe. ... The Terran Empire is, in the fictional universe of Star Trek, an alternate-history counterpart of the United Federation of Planets. ... The Enterprise boldly going where no man had gone before. ... In the Star Trek television series, the Mirror Universe is an alternate reality. ...
ISS Avenger contains a highly racially diverse crew of various species from across the Empire, including Vulcans, Andorians, and at least one Orion female. ISSAvenger is an NX class starship, the same class as ISS Enterprise. After Avenger's alien crewmembers mutiny against the Empire, the ship is destroyed by the Defiant under the command of Jonathan Archer. This article or section should include material from Orion Syndicate. ... The Earth starship Enterprise (NX-01) In the Star Trek fictional universe, the NX class was a variety of starship produced by Earth Starfleet prior to the United Federation of Planets. ... A Constitution class starship In the fictional Star Trek universe, the USS Defiant (NCC-1764) was a Federation Constitution class starship. ... Captain Jonathan Archer Captain Jonathan Archer, played by Scott Bakula, is the captain of the starship Enterprise (NX-01) in the fictional television series Star Trek: Enterprise. ...
In the mirror universe, the ISSAvenger (NX-09) was an NX-class vessel built at the Antares Ship Yards serving the Terran Empire under the command of Admiral Black.
In early 2155, the Avenger was caught in an attack by rebels and suffered heavy damage until assisted by the USS Defiant.
According to "In a Mirror, Darkly, Part II" writer Mike Sussman, the name of the ISSAvenger was an homage to the Star Destroyer Avenger from Star Wars Episode V: The Empire Strikes Back.