ISS Excelsior (NCC-2000)

In the mirror universe, the ISS Excelsior (NCC-2000) was a Terran Empire prototype Excelsior class starship in service to the Imperial Starfleet in the 23rd century.

Service
In the year 2285, ISS Excelsior was under the command of Captain Styles. When Styles betrayed the Empire, Excelsior crewmember Tuvok was forced to kill Styles and take command.

By the early 2290s the Excelsior was commanded by Captain Hikaru Sulu. The crew of the ship exchanged places briefly with their counterparts from the primary universe after a incident at the Janus Vortex. After fighting against the ISS Enterprise-A under the command of Pavel Chekov, the crew from the primary universe attempted to reach Janus Ultima after the destruction of Janus Prime. Along the way, they came under attack from Klingon forces until they were driven off by the ISS Renegade who escorted the Excelsior back to friendly space without knowing that the Sulu in command was not from their universe.