Although popularised by the Star Wars series (see below) and used sporadically in films such as The Godfather and Ghostbusters, this title-only billing became an established form for summer blockbusters in 1989, with Ghostbusters II, Lethal Weapon 2, and The Abyss following the practice.[2] Occasionally, even the title is left to the end, such as in Avatar, The Passion of the Christ, Inception,