Steve continues his search for undiscovered animals in South America, joining a group of scientists, naturalists and film-makers all united by the common goal of saving Guyana's wildlife. They will record every animal they see in the hope of proving these jungles are too precious to be cut down. Steve ventures up unexplored rivers discovering that real-life monsters lurk in the deep... including caimen, sabre-toothed hunters, blood-sucking parasites and a fish totally new to science.