公元前52年,罗马共和国正值鼎盛时期,执政官庞贝(里克•沃登 Rick Warden 饰)坐守都城,盟友凯撒(塞伦•希德 Ciarán Hinds 饰)征战高卢。期间,第13军团屡立战功,主将乌里纳斯(凯文•马克德 Kevin McKidd 饰)有勇有谋,手下波罗(雷•史蒂文森 Ray Steven……
Siblings, Eric & his surreal artist sister Kay, her doctor husband David, her sister-in-law Brooke along with pilot Marsh become stranded on a rugged isle face off against a supernatural beast drawn to Kay who dreams of its killings