Star Wars expanded to other media the characters Luke Skywalker, Princess Leia, Han Solo, and the Wookiee Chewbacca—assisted by the Jedi Obi-Wan Kenobi and the droids C-3PO and R2-D2—to thwart the evil plans of Sith Lord Darth Vader and the Galactic Empire. The film was followed by multiple sequel and prequel films. Along the production of the films were an array of derivative "Star Wars" works (set in the same continuity as the films), including books, comic books, video games, and television series, which take place at the same time as, between, and after the events of the original trilogy (1977–1983) and prequel trilogy (1999–2005). All
Star Wars: Episode III – Revenge of the Sith state to fight a Sith Lord. These are a few examples of many descriptions of characters' feelings and inner narrative. There are even some humorous lines added in, including extra dialogue in the battle between Grievous and Obi Wan - Grievous says, "I was trained by Count Dooku," and Obi-Wan replies, "What a coincidence; I trained the man who killed him." An official prequel novel, "Labyrinth of Evil" () by James Luceno, was published in 2005. It is set near the end of the Clone Wars and directly before the events of "Star Wars: Episode III Revenge of the Sith".