In this pulse-pounding sci-fi thriller, female adventurer Parker joins a crew of male trophy hunters in a remote wilderness park. Their goal: slaughter genetically recreated dinosaurs for sport using rifles, arrows, and grenades. After their guide is killed by raptors, the team tries to escape the park, but the hunters quickly become the hunted. Even worse, the park's manager suspects Parker of being a spy and sends a hit squad after her. This battle's about to become primitive.

1980年代，美苏衝突不慎释放出上万隻潜藏在地球，名为「卓巴」的外星人。不料带有病毒的卓巴引起致命传染病而受到地球军团剷除，卓巴灭绝后，军团随之解散。多年后，昔日军团成员却意外遇刺，疑似尚未被根除的卓巴前来复仇，剩馀的军团成员必须找到彼此，在被卓巴变种人杀死前，找出反击之道。

受到今天可能仍然逍遥法外的连环杀手的真实故事启发。