Star Wars Original Trilogy Series

For the second draft, Lucas made heavy simplifications, and introduced the young hero on a farm as Luke Starkiller. Annikin became Luke's father, a wise Jedi knight. "The Force" was also introduced as a mystical energy field. The next draft removed the father character and replaced him with a substitute named Ben Kenobi, and in 1976 a fourth draft had been prepared for principal photography. The film was titled Adventures of Luke Starkiller, as taken from the Journal of the Whills, Saga I: The Star Wars. During production, Lucas changed Luke's name to Skywalker and altered the title to simply The Star Wars and finally Star Wars.

At that point, Lucas was not expecting the film to become part of a series. The fourth draft of the script underwent subtle changes that made it more satisfying as a self-contained film, ending with the destruction of the Empire itself by way of destroying the Death Star. However, Lucas had previously conceived of the film as the first in a series of adventures. Later, he realized the film would not in fact be the first in the sequence, but a film in the second trilogy in the saga. This is stated explicitly in George Lucas' preface to the 1994 reissue of Splinter of the Mind's Eye:

It wasn't long after I began writing Star Wars that I realized the story was more than a single film could hold. As the saga of the Skywalkers and Jedi Knights unfolded, I began to see it as a tale that could take at least nine films to tell - three trilogies - and I realized, in making my way through the back story and after story, that I was really setting out to write the middle story.

#HWCMC92 - Star Wars V The Empire Strikes Back - TIE Fighter (1:18 Scale)