- There is confusion over the registry of the Spector with at least three sources giving different registries: ILM, NCC-63549; Fact Files, NCC-65549; and Starships, NCC-63015. In the case of ILM, this registry was given to the USS Thunderchild. The Thunderchild itself had a registry of NCC-63898. As production sources have greater weight, the registry of the Spector is NCC-63898. The chart from ILM can be seen here.
In 2374, the Spector was one of three starships that were assigned to recapture the USS Prometheus after it fell into the hands of the Tal Shiar. (VOY episode: "Message in a Bottle"; ST reference: Star Trek Fact Files; Decipher RPG modules: Starfleet Operations Manual, Starships)