In Lucas's 1975 draft, "Adventures of the Starkiller as taken from the Journal of the Whills, Saga I: The Star Wars", the capital planet of Alderaan is described as a floating city in the clouds, "suspended in a sea of cirrus methane". A planet described in Lucas's draft script as being "under siege by the Imperial Legions of Alderaan" and which is later destroyed is named as "Ogana Major". Early sketches commissioned by Lucas from conceptual illustrator Ralph McQuarrie show a design which very closely resembles Cloud City, as featured in the later sequel, "The Empire Strikes Back". In Lucas's third draft, the Imperial City of Alderaan has become the home world of the Sith Lords, and Darth Vader holds Princess Leia captive here. Lucas continued to hone his script, aided by screenwriters Willard Huyck and Gloria Katz; names of planets and characters were revised and the narrative was improved, and by the fourth draft, scenes on the Imperial capital planet had been moved to a space station called the Death Star and the peaceful world destroyed by the Empire had taken the name Alderaan.