The USS Shadowstar (NCC-1875) was an Avenger-class heavy frigate active in the 23rd century. (Starfleet International: Starfleet Communiqué, May 1985)
- This ship may exist in an alternate timeline from that of USS Odin, a vessel of the same class that had the same registry number.
Shadowstar was commanded by Captain Sandor Xen Konger-Thaos. (Starfleet Communiqué 20)
Shadowstar went missing ca. 2285, with no information found as of 2312. It was not known if Shadowstar Station was named after her. (Star Trek: Shadowstar Station)