The I.S.S. Galaxy is a modified Galaxy-class cruiser in service to the Terran Empire's Imperial Starfleet in 2409, and the mirror universe counterpart to the Federation starship U.S.S. Galaxy. She partakes in Captain James O'Brien's attempted invasion of the Federation in 2409.
- See Terran Cruiser.
- The Galaxy had a purple hull material until June 2012, when all Terran ships were redesigned with canon yellow markings. The Galaxy also had its saucer, neck, and pylons modified, making them more akin to those of the Venture-class. The model was updated again in April 2015 when the Galaxy-class model was revamped.