Indy 4 Spoilers

"Older and Wiser. Indy doesn't mellow with age. Twenty-one years after embarking on the search for the Ark of the Covenant, he is drawn into a quest that proves equally challenging and ultimately just as profound. Beginning at a government hangar in Nevada [Area 51 ???], the adventure takes Indy and a young companion to the coastal desert of Peru, and finally into the geart of the Amazon jungle---where some lives will be lost and others will be transformed"

Regarding John Hurt's character (Ox):
"Born in Leeds in 1887, 'freelance' archeologist Harold Oxley studied with Indy at Oxford under Professor Abner Ravenwood, and later became a close friend of Marion. But Oxley didn't share Ravenwood's fascination for finding Tanis and the Ark of the Covenant. Obsessed with unearthing a crystal skull, Oxley focused his efforts on Central and South Americas, and for many years sought fearlessly to prove that legends regarding El Dorado were based on fact. A close friend of Indy's for many years, Oxley, without explanation, broke off all communication with him in 1937."

Regarding the "Mayans" in the movie (I was right all along - they aren't Mayans!):
"The Amazon rainforest conceals many secrets. Since Pizarro's conquest of Peru, rumors have persisted of the existance of a city of gold, known by the early conquistadors as El Dorado, and by the Inca as Akator. Built by the Ugha people with the help of their gods [ETs ?????], Akator was said to have been millennia ahead of its time. The search for the city claimed the lives of many explorers and comes close to claiming Indy."

"Akator bequeathed monolithic architecture to the Tihuanacans; precision stonework to the Inca; corbel arch construction to the Maya; and ghoulish sculpture to the Aztec. An American Atlantis, it may be the source from which all other cities sprang."

Regarding Spalko:
"Raised in a superstitious Ukranian village, where her psychic abilities led her being branded a 'witch', Irina Spalko was handpicked by Stalin to oversee research into psychic warfare. A former member of the KGB's Science and Technology Directorate, Spalko has been decorated with the Order of Lenin, Her powers of intuition have taken her a long way from the experiments she performed on animals as a teenager. As voracious a seeker of truth as any Indy has ever met, Spalko shows there is no limit to how far she is prepared to go to achieve her goals. Her expertise with the saber, rapier, and foil drives the point home."