A 1965-set adventure film directed by Steve Carver that follows an Amazon guide navigating treacherous jungle terrain toward a legendary lost city. The expedition's objective: locating a rogue Nazi scientist operating in the remote wilderness. Featuring Michael Dudikoff, Donald Pleasence, and Robert Vaughn in a tale of exploration, danger, and historical intrigue adapted from Alistair MacLean's source material, with additional writing by Andrew Deutsch and Edward Simpson.