ISS Enterprise (NCC-1701)
From Memory Alpha, the free Star Trek reference.
The ISS (Imperial Star Ship) Enterprise existed in a parallel universe that is somehow connected to ours (referred to by some as the "mirror universe"). During an ion storm in 2267, a landing party from the USS Enterprise was transported to this mirror starship.
The mirror Starfleet's ISS Enterprise was almost identical in configuration to a Federation Constitution-class heavy cruiser of the 2260s, the USS Enterprise, and bears the same registry, NCC-1701. However, many minute details distinguished it such as the dagger emblem of the Terran Empire painted on the doors, and the posting of armed soldiers in the corridors. (TOS: "Mirror, Mirror").
- The producers wanted to show the ISS Enterprise flying from right to left rather than the normal left-to-right motion of the regular version. However, the Enterprise model was only built to be filmed from one side, as the other housed supports and wires and was not detailed. The effects crew ended up using a shot where the registry decals had been redone in reverse, and "mirroring" the film (reversing it) after the model was shot.
- The 2006 "remastered" version of "Mirror, Mirror" featured a new, computer-generated version of the ISS Enterprise. While generally faithful to the original, the new version featured correct ISS markings and a darker, gunmetal gray hull coloration.
