Big-budget alien invasion sci-fi action thriller starring Aaron Eckhart and Michelle Rodriguez. When the world's biggest cities are subjected to a coordinated surprise attack from a hostile extraterrestrial invasion, it is up to a Marine staff sergeant (Eckhart) and his newly-formed platoon to provide the first line of defence against the alien intruders as they strike Los Angeles. Making up the rules as they go along, the soldiers must give it their all as they defend their city against an unknown enemy.