The I.S.S. Sovereign is a Sovereign-class cruiser in service to the Terran Empire's Imperial Starfleet, and the mirror universe counterpart of the Federation starship U.S.S. Sovereign. This Sovereign partakes in Captain James O'Brien's attempted invasion of the Federation in 2409.
- See Terran Cruiser.
- In June 2012, the Sovereign replaced the I.S.S. Noble in-game.
- The Sovereign's registry contains the prefix "NC" rather than the conventional "NCC".