Star Trek Johnny Lightning Legends of Series 6: Ships Of The Line Romulan D7 Battlecruiser Star Trek Legends of Star Trek Romulan D7 Battlecruiser. From the Johnny Lightning Series Six: Ships of the Line. The Approximate Size of the Romulan D7 Battlecruiser is 3.75 inches long. Includes Die-Cast Display Stand. From the Hit Star Trek Television Series and Movies.