Star Destroyers are capital ships in the fictional Star Wars universe. The Imperial Star Destroyer, which first appears in the first seconds of Star Wars (1977), is "the signature vessel of the Imperial fleet". The term "Star Destroyer" also refers to other vessels in the franchise.
Numerous Star Destroyer models and toys have been released, and the iconic scene featuring the vessel's first appearance has been called "a milestone in special effects history".
In draft scripts for the film that would become Star Wars, the term "Stardestroyer" refers to two-man fighters flown by what would become the Galactic Empire. The film's second draft features four Star Destroyers chasing a single Rebel ship, but the tremendous costs incurred by Industrial Light & Magic (ILM) when production began helped lead Lucas to use a single "terrifyingly large" Star Destroyer instead of four. ILM built a 91-centimeter (36 in) shooting model that was about half the size of the model for the Tantive IV the Star Destroyer was chasing. Lucas asked ILM to build a larger Star Destroyer model to match the Tantive IV's scale, but ILM convinced him that the Dykstraflex camera invented for the film made this unnecessary. Nevertheless, they added additional hull details to the Star Destroyer model. The 13-second opening shot was the first special effects piece ILM completed, and its success was an essential test for the Dykstraflex.
ILM built a 259-centimeter (102 in) Star Destroyer, equipped with internal lighting to provide a better sense of scale, for The Empire Strikes Back (1980). During production, Lucas decided that every Star Wars film would open in space with a shot of a Star Destroyer.The Empire Strikes Back also introduces the "Super Star Destroyer", also referred to as a "Star Dreadnought". The shooting model for the Super Star Destroyer Executor in The Empire Strikes Back and Return of the Jedi was 282 centimeters (111 in) long.
The design of the Venator-class Star Destroyers appearing in Revenge of the Sith (2005) are meant to bridge the appearance of the Acclamator-class transports in Attack of the Clones (2002) and the Imperial class in the original trilogy.