2011年洛杉磯受到外星人大舉入侵，美軍全力抵抗，究竟真相是怎樣？本片融合歷史事件，並賦以角色嶄新詮釋，意圖揭開歷史的神秘面紗。一支美軍海軍陸戰隊菁英在隊長（Aaron Eckhart飾演）帶領之下，準備對抗入侵洛杉磯的外星異形部隊，這場人類存亡之戰將超乎想像...

For years, there have been documented cases of UFO sightings around the world – Buenos Aires, Seoul, France, Germany, China. But in 2011, what were once just sightings will become a terrifying reality when Earth is attacked by unknown forces. As people everywhere watch the world’s great cities fall, Los Angeles becomes the last stand for mankind in a battle no one expected. It’s up to a Marine staff sergeant (Aaron Eckhart) and his new platoon to draw a line in the sand as they take on an enemy unlike any they’ve ever encountered before.