The earth was suddenly attacked by unknown forces.When people from all over the world witnessed the fall of bustling cities in the war, Los Angeles became the last line of defense for mankind.A war beyond everyone's expectations is taking place. An experienced Marine Commander led his newly formed recruits to shoulder the heavy responsibility of this life-and-death battle.They are going to draw the last line of human defense on the edge of the doomsday and face a powerful enemy that is unprecedented and unpredictable.This is not a battlefield they are familiar with, but an ultimate test of survival and belief.