<P> In 1957, Indiana Jones and his partner George "Mac" McHale are kidnapped in New Mexico by Soviet agents under Colonel Dr. Irina Spalko . The Soviets infiltrate a warehouse labeled "Warehouse 51" and force Jones to locate a mummified alien corpse, recovered ten years earlier . Upon its discovery, Mac reveals he is a double agent working for the Soviets . Jones escapes and unsuccessfully attempts to retrieve the body . After a fight with Spalko's sadistic henchman, Colonel Antonin Dovchenko, Jones escapes to Doomtown (a model town), at the Nevada Test Site, minutes before an atomic bomb test, and takes shelter in a lead - lined refrigerator . Jones is rescued, decontaminated, and apprehended by FBI agents, who suspect him of working for the Soviets; and though freed on the recommendation of General Ross, who vouches for him, he is put on indefinite leave of absence from Marshall College . His leaving also causes the dean's resignation to keep Indiana's job at the college . </P> <P> Jones is approached by greaser Mutt Williams, who tells him that Harold Oxley had found a crystal skull in Peru, suffered a mental breakdown and was later kidnapped . Jones tells Mutt about the legend of crystal skulls found in Akator . Mutt gives Jones a letter from his mother, who is also held captive, containing a riddle written by Oxley in an ancient South American language . KGB agents attempt to capture them, but Jones and Mutt evade them and reach Peru . At the local psychiatric hospital, Oxley's scribbles on the walls and floor of his cell lead them to the grave of Francisco de Orellana, a Conquistador who has searched for Akator . They discover the skull at the grave, with Jones reasoning that Oxley had returned it there . </P> <P> 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 reveals that Mutt is Jones' son, Henry Jones III . 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, but Marion and Jones get caught into a dry sandpit, to be recaptured by the Soviets after Oxley accidentally got them caught . On their way to Akator, Mac tells Jones he is a CIA double - agent to regain Jones' trust, and Jones' team fights its way out of the Soviets' clutches, while Dovchenko is devoured by siafu ants . Jones and his allies survive three waterfalls in an amphibious vehicle, while many of the Soviets fall from a cliff while trying to pursue them . Jones and Oxley identify a head - like rock formation that leads them to Akator, unaware that Mac lied about being a CIA agent, is still loyal to Spalko and has been dropping transceivers to allow the surviving Soviets to track them . </P> <P> The adventurers escape the city's guardians, gain access to the temple, and find it filled with artifacts from many ancient civilizations, identifying the aliens as extra-dimensional "archaeologists" studying the different cultures of Earth . They find and enter a chamber containing the crystal skeletons of thirteen alien beings, one missing its skull . Spalko arrives and presents the skull to its skeleton, whereupon the aliens reanimate and telepathically offer a reward in ancient Mayan through Oxley . A portal to their dimension becomes activated, and Spalko demands knowledge equal to the aliens' . The thirteen beings fuse into one, and in the process of receiving the overwhelming knowledge, Spalko is disintegrated and sucked into the portal . Jones, Marion, Mutt, and Oxley--who has regained his sanity--escape, while the remaining Soviets are also drawn into the portal . Mac is caught in the vortex while trying to scrounge some of the treasure, and even though Jones offers him his whip to pull him to safety, he willingly lets go and is sucked in . Jones and the others escape and watch as the temple walls crumble, revealing a flying saucer rising from the debris and vanishing, while the hollow in the valley floor left by its departure is flooded by the waters of the Amazon . </P>

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