The following is a list of illusory starships.
This illusion of a D'deridex-class Romulan warbird was created by Nagilum. It opened fire on the USS Enterprise-D, which returned fire and destroyed the warbird with a single photon torpedo. Captain Picard noted that "that was too easy" and and Data detected no debris from the Romulan ship. These were signs that something strange was going on. (TNG: "Where Silence Has Lease")