Luke Sparke, best known for directing the science-fiction action flick Occupation and its sequel, Occupation: Rainfall, will write and direct a film adaptation of Ethan Pettus’ first novel in the ongoing Primitive War book series, titled Primitive War: Opiate Undertow.

The film adaptation will come as a sci-fi horror set in 1968 Vietnam. The Primitive War film will follow a search and rescue team known as the Vulture Squad as they are sent to an isolated jungle valley to uncover the fate of a missing Green Beret platoon. As the team hunt through the primordial depths of the valley and the number of confirmed casualties grow, the Vulture Squad are forced to embrace their savage instincts if they are to survive the ancient horrors of the jungle… including the ultimate apex predators, the dinosaurs.

Pettus shared, “It’s a dream come true. Primitive War is a story that’s larger than life, and I think Luke and his team can make it into a cinematic masterpiece.”

Meanwhile, writer-director Sparke also expressed his excitement: “Dinosaurs in the Vietnam war? What’s not to love about that concept?! When I first heard about the books, I loved the ideas and concepts Ethan brought into them, and we’re shaping our film version into an exciting survival-horror film.”