Spielberg liked the story outline presented by Lucas and Boam, but wanted a first draft before making a decision to move forward. He was planning direct the film "Rain Man", but an Indiana Jones project would take precedence. Boam signed a contract on April 14, 1987. He wrote his first draft that summer, and turned it in on September 15, with another revision on September 30. It was at that time that Spielberg made a commitment to direct the Indiana Jones film over "Rain Man", based on reading one of Boam's unfinished drafts. Spielberg said, "We licked it with Boam". Spielberg brought actor Sean Connery in to portray Henry Jones Sr., and Connery provided substantial input into the character, who Lucas originally conceived as an eccentric professor—"an Obi-Wan Kenobi type." Boam wanted to expand the father character, making him more central to the plot. He said that in Meyjes' original script, "the father was sort of a MacGuffin ... they didn't find the father until the very end. I said to George, 'It doesn't make sense to find the father at the end. Why don't they find him in the middle?'" He wanted the father-son relationship to be the main point, rather than the Grail. With the input of Spielberg and Connery, Boam altered the senior Jones from "a somewhat crotchety old character" to a man with more "vitality". Connery wanted the father to have a prior sexual relationship to the same female archeologist that Indiana Jones sleeps with. Boam incorporated this into the script, with Indiana's reaction to learning that he and his father slept with the same woman defused through humor. Boam said, "He's a bit humbled and surprised that his dad would be able to attract this young attractive woman ... but he isn't appalled by it."