Special features: Behind the battle ; aliens in L.A. ; preparing for battle ; creating L.A. ; Blu-ray exclusives: Directing the Battle ; Boot camp ; The freeway battle ; Command control. Not rated.

Written by Chris Bertolini ; produced by Neal H. Moritz, Ori Marmur ; directed by Jonathan Liebesman. Music, Brian Tyler ; editor, Christian Wagner ; director of photography, Lukas Ettlin.

Aaron Eckhart, Bridget Moynahan, Cory Hardrict, Michelle Rodriguez, Ramon Rodriguez.

For years, there have been documented cases of UFO sightings around the world. 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 and his new platoon to draw a line in the sand as they take on an enemy unlike any they've ever encountered before.

Rated: PG-13. Parents strongly cautioned (sustained and intense sequences of war violence and destruction, and for language).

Blu-ray disc ; widescreen (2.40:1) presentation ; Dolby Digital 5.1 surround, 1080p High Definition ; All regions ; requires Blu-ray player.

Language options In English, French, Spanish 5.1 Dolby Digital, and Portuguese 5/1 DTS-HD MA, English audio description. Subtitle options in English SDH, Portuguese, French and Spanish. English captions. English descriptive narrative.