A small group of town residents have to band together after a devastating ground invasion. As they struggle to survive, they realize th ey must stay one step ahead of their attackers, and work together for a chance to strike back

一艘外星飞船坠毁在沙漠中一个与世隔绝的小镇上。它被保护的内容被破坏，释放出一种潜伏的寄生虫，攻击包括人类在内的所有生物的大脑，使它们迷失方向，不自然地变得强壮。