During the Hangar 51 scene, the theme for the Ark of the Covenant from Raiders of the Lost Ark (1981) is heard when the Ark makes its brief appearance.
Indiana Jones and the Kingdom of the Crystal Skull
Set during the Cold War, the Soviets – led by sword-wielding Irina Spalko – are in search of a crystal skull which has supernatural powers related to a mystical Lost City of Gold. After being captured and then escaping from them, Indy is coerced to head to Peru at the behest of a young man whose friend – and Indy's colleague – Professor Oxley has been captured for his knowledge of the skull's whereabouts.
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