A team of scientists, with a squad of battle-hardened mercenaries as security, travel deep into the Amazon Rainforest on a perilous expedition. In the remotest parts of the jungle it doesn't take long for events to spiral out of control and when the expedition is ambushed they find themselves trapped in the heart of an inhospitable lost valley. To survive, the team will have to battle not only the harsh environment but some of prehistory's greatest...