Star Wars
Many books, short movies, and video games have been produced that deal with events that do not happen in the original movies. They also tell more about things that did happen in the movies. For example, the book Death Star tells about the building and destruction of the space station from the original movie. It tells much about things seen in that movie but from the point of view of the people on the station. A different example is that in the Expanded Universe, sometimes the Sith are shown as the protagonists. Most of the stories in the Expanded Universe are about the rebuilding of the Republic after the Empire's defeat.  They are set anywhere from the early Sith Wars which happened 5,000 years before Episode VI to more than one hundred years after Episode VI.