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 Star Wars universe. Star Destroyers appear in the original three Star Wars movies and in Revenge of the Sith (2005). In addition to their movie appearances, Star Destroyers appear throughout the Star Wars expanded universe in books, comics, and games. Numerous Star Destroyer models and toys have been released.