The plot is incomprehensible gibberish about a crystal skull, the lost Amazonian city of Akator, and a brain-fried archeologist named Ox (John Hurt, who is anything but an ox).
Anthropologists tell us that our predecessors would chow down on high-calorie, fatty foods because some brain wave told them to grab a leg of deep fried Tyrannosaurus Rex whenever possible to store up fat for leaner times.