After the release of "Magic Territory", Steven Spielberg decided to continue to complete the last part of the trilogy in order to fulfill his promise to George Lucas. Time flies, Spielberg, who decided to shoot "Jihad Ark", has entered middle age, and his beard and sideburns are showing signs of graying. The experience of Lucas, Harrison Ford and his new fathers reminded him of the relationship between father and son. Although Spielberg's relationship with his father is not harmonious, he still wants to find a father for Indiana Jones and portray the emotional journey of the father and son with the thrilling experience of finding the Holy Grail.
In order to direct the film, Spielberg declined the invitation of the producers of "Rain Man" and "Leap to the Future". In the early stage of creation, the creators wanted to write the Monkey King and the Haunted Castle, which were not adopted in the previous episode, into the script, so Chris Columbus, who was still a screenwriter at the time, completed the script called "Indiana Jones and the Monkey King" accordingly. , But the script ultimately failed to be approved by Lucas and Spielberg. Lucas once suggested using the Holy Grail as the main line, but was initially rejected by Spielberg because he thought it was a duplicate of "Mondy Peden and the Holy Grail." When the idea of telling the story of father and son came up, Spielberg began to think that the holy grail was a good idea. The holy grail that everyone is struggling to find can become a symbol of reconciliation between father and son. Lucas originally thought that the concept of the Holy Grail was a bit thin, but he later discovered that the father-son relationship that Spielberg thought of added more connotation to the film, and the whole story suddenly became fuller.
