Vietnam. 1968. A search and rescue team known as Vulture Squad is sent to an isolated jungle valley to uncover the fate of a missing Green Beret platoon. As they hunt through the primordial depths of the valley, they discover ancient horrors that not only threaten to unravel their minds, but to end their lives as well. Dinosaurs have somehow been unleashed! When the casualties mount, the men of Vulture Squad must abandon their human nature and give in to their savage instincts in order to survive…the Primitive War.