By the 1990s, some films had moved all billing to the film's end, with the exception of company logos and the title. Although popularised by the "Star Wars" series (see below) and used sporadically in films such as "The Godfather" (1972) and "Ghostbusters" (1984), this "title-only" billing became an established form for summer blockbusters in 1989, with "Ghostbusters II" (1989), "Lethal Weapon 2" (1989), and "The Abyss" (1989) following the practice. Occasionally, even the title is left to the end, such as in "The Passion of the Christ" (2004), "Avatar" (2009), "Inception" (2010), and the "Dark Knight" trilogy.