Ryan Kwanten, Jeremy Piven and fellow battle-hardened U.S. soldiers during the Vietnam War discover dinosaurs among their deadly jungle enemies in the trailer for Primitive War.

Luke Sparkes upcoming sci-fi horror pic is based on Ethan Pettus book where American soldiers in an elite unit in Vietnam discover their enemies are not all human.Three days ago, I lost my Green berets. There was something going on in that battle, Pivens character says at one point in the trailer.

A logline from the films producers adds about the mystery: Set in Vietnam in 1968, thePrimitive Warmovie will follow a search and rescue team known as Vulture Squad sent to an isolated jungle valley to reveal the fate of a missing Green Beret platoon. As they hunt through the primordial depths of the valley and the casualties mount, the Vulture Squad members must embrace their savage instincts to survive the horrors they face, including the ultimate Apex predators, dinosaurs. Australian director Sparke helmed, co-wrote the adapted script, produced, edited and production designedPrimitive War.The ensemble cast includes Tricia Helfer, Nick Wechsler, Ana Thu Nguyen and Jake Ryan.

Dinosaurs in the Vietnam war? Whats not to love about that concept?! When I first heard about the books, I loved the ideas and concepts Ethan brought into them, and were shaping our film version into an exciting survival-horror film, Sparke said in a statement when first taking on the project in 2022.

ThePrimitive Warhistorical sci-fi military novel series includesPrimitive War II: Animus Infernaland the upcoming third installmentPrimitive War III: Aeon Ouroboros. Carly Imrie, Zachary Garred and Alex Becconsall will produce thePrimitive Warfilm as they reteam with co-producer Sparke afterOccupation: Rainfall, the franchise sequel that follows a group of survivors in Sydney fighting a desperate war two years after an extraterrestrial invasion.