As we all know, George Lucas and the makers of the Star Wars saga have had many ideas in the outline of the Saga. Many went unused, but few managed to turn up later in other works. Here's a few I noticed: A battle between Wookiees and Imperials was planned in the early stages for A New Hope. The idea was later modified for Return of the Jedi by changing the planet Kashyyyk to Endor and Wookiees to Ewoks. The idea was finally realized in Revenge of the Sith, putting the Wookiees against the Separatists. The mention of midichlorians dates back to the early drafts of the original Star Wars, but was not applicable to the original trilogy. An explanation was finally given in The Phantom Menace. Bail Organa/Antilles was intended to be Princess Leia's father in A New Hope. He was intended to appear in the Phantom Menace, but was once again removed. Also in The Phantom Menace, there is mention of his original name, Bail Antilles as a representative of Alderaan. The character of Bail Organa was finally given a proper introduction as the senator of Alderaan in Attack of the Clones. One of the earliest concepts of Star Wars names the character of Mace Windy as a famed Jedi. The character is introduced as one of the most powerful Jedi in the order in The Phantom Menace. It's been said that Ralph McQuarrie's original concept of the Millennium Falcon inspired the design of the Republic Cruiser in The Phantom Menace. Lucas imagined C-3PO being built by a young farm boy. This was modified to be young slave boy, Anakin Skywalker, in The Phantom Menace. Lucas said early on that Vader got his injuries through falling into a pit of lava on a volcanic planet. In Revenge of the Sith, we see the Vader catches fire from the heat of the lava on Mustafar. Boba Fett was invisioned as a specialized brand of Imperial troops in pre-production for The Empire Strikes Back. In Attack of the Clones, we see Boba's father as the template for the clone army of the Republic, which would later become the Imperial troops. The Empire's stronghold was originally to be on Alderaan in the plans of A New Hope. The idea was revived, but unused for Return of the Jedi under the name Had Abbadon as the capital of the Empire. At this point, the planet consisted of an entire city, and housed the Emperor's secret lair. Coruscant was finally seen onscreen the Special Edition of Return of the Jedi (while the planet was revealed in greater detail in the Prequel trilogy). The Emperor had a lightsaber hidden up his sleeve in an early draft of Return of the Jedi. In Revenge of the Sith, Palpatine revealed his hidden saber in the same fashion. The Neimoidians seen in the Phantom Menace were originally invisioned as organic versions of the battle droids. This idea was later attributed to Geonosians in Attack of the Clones. Watto's character from the Phantom Menace originally sported a sun hat in his original design. This was later shown in Attack of the Clones. In other media, I found these: The design on Captain Rex's helmet in The Clone Wars seems based off the original design on the Boba Fett costume during the pre-production of The Empire Strikes Back. Young Boba Fett's helmet in The Clone Wars is based off the Boba Fett designs by Ralph McQuarrie.