chunk: Jones and Mutt are captured by Mac and the Soviets and taken to their camp in the Amazon jungle, where they find Oxley and Mutt's mother, Marion Ravenwood, who later reveals that Mutt is Jones' son, Henry Jones III. Jones berates her for not convincing him to finish school. Mac tells Jones he is really a CIA double-agent to regain Jones' trust. Spalko believes that the crystal skull belongs to an alien life form and holds great psychic power, and that finding more skulls in Akator will grant the Soviets the advantage of psychic warfare. Spalko uses the skull on Jones to enable him to understand Oxley and identify a route to Akator. Jones and his four allies escape with the skull into the Amazon. They elude giant ants, which devour Dovchenko after Jones beats him in a fight. Jones and his allies survive three waterfalls in a GAZ 46 amphibious vehicle, as many of the Soviets fall from a cliff while trying to pursue them. Jones and Oxley then identify a rock formation that leads them to