Multiple realities
(covers information from several alternate timelines)

Nador's starship was a Cardassian Galor-class starship in several of the parallel universes encountered by Worf in 2370, of which Gul Nador was commanding officer.

In one reality, Nador had used this vessel to reprogram the Argus Array to spy on Federation shipbuilding facilities such as the Utopia Planitia Fleet Yards, Deep Space 5, Starbase 47 and the Iadara colony. In another, the Argus Array ceased functioning due to a mechanical failure and Nador expressed his concern that the Federation had been using it to spy on the Cardassian Union. In a third reality, the ship attacked the USS Enterprise-D, leading to the death of its chief engineer Geordi La Forge. (TNG: "Parallels")

It was never established whether or not Nador or his vessel existed in the "regular" reality of Star Trek's universe.
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