Star Wars: The New Jedi Order (or New Jedi Order or NJO) is a series of nineteen science fiction novels, published from 1999 to 2003, set in the Star Wars expanded universe. The series revolves around the Yuuzhan Vong invasion of the galaxy 21–26 years after the events depicted in Return of the Jedi. The New Jedi Order was the restored and reformed Jedi organization, in the wake of the Great Jedi Purge and subsequent fall of the Galactic Empire. The Jedi Knights, reduced in number to only a handful, were slowly restored, primarily under the leadership of Luke Skywalker. Additional stories, generally published as e-book novellas (some published as recently as 2006) and comic books (as recent as 2010/2011), take the total number of published NJO-related stories to twenty-six.