Lucas has credit "Story by" on each of the four Indy films. But how close are his early drafts / treatments to the all final films? Information about this on the Internet is not as detailed as the history of the development / writing of OT. Lucas wrote early script The Adventures of Indiana Smith in 1973-74. But why did he write the ROTLA treatment in January 1978 from scratch instead of using this script? How close was this treatment to the movie we know? It is known for The Last Crusade that Lucas wrote a treatment, which was essentially a different film, and he gave it to Columbus. Then he wrote another one treatment for Jeffrey Bohm. How close was it to the end result? Kingdom of the Crystal Skull also has a rather complicated history of writing and changing many writers, among which the contribution of Lucas is somewhat lost.