Behind the scenes of 'Indiana Jones and the Kingdom of the Crystal Skull,' a creative battle raged between Steven Spielberg, George Lucas, and star Harrison Ford. According to a Spielberg oral history recently published by Vulture, both Spielberg and Ford struggled with the film's direction and specifically opposed Lucas's decision to incorporate aliens into the storyline. Despite their reservations, the alien element made it into the final film—a choice that ultimately became one of the franchise's most debated creative decisions.

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