An explorer leads an expedition into the Amazon jungle to find a lost city. He discovers the lair of a Nazi war criminal, who is performing disturbing scientific experiments, but also finds his travelling companions have their own hidden agendas. Action adventure, starring Michael Dudikoff, Robert Vaughn, Donald Pleasence and Herbert Lom.

An adventurer (Hamilton) decides to go in search of the Lost City in the Amazon jungle. A motley crew of other people decide to join him for the wealth of the city, for reasons of their own. But to their horror they find out that they have bitten off more than they can chew, what with a Nazi doctor still using the place for his human experiments.