Lucas outlined a new backstory: Anakin Skywalker had been Ben Kenobi's brilliant student, and had a child named Luke, but was swayed to the dark side by the Emperor (who was really a Sith Lord). Anakin battled Kenobi on the site of a volcano and was horribly wounded, but was resurrected as Darth Vader (this idea would later be realised on screen over 25 years later in ""). Meanwhile, Kenobi hid Luke on Tatooine while the Republic became the Empire and Vader systematically hunted down the Jedi. With this new backstory in place, Lucas decided that "The Empire Strikes Back" would be the second film of two trilogies, designating it "Episode V" by the fifth draft. Lawrence Kasdan had just completed writing "Raiders of the Lost Ark", and Lucas hired him to write the next drafts with input from director Irvin Kershner. Kasdan, Kershner, and producer Gary Kurtz saw the film as a more serious and adult film, helped by the new, darker storyline, and developed the series from the light adventure roots of the first film.