There’s already an Alien threat in your city, on your street, and in your home.

Resistance is futile; the best you can hope for is survival.

These menacing extraterrestrials are highly-intelligent and have made their presence invisible to the naked eye. In order to view the threat, you must engage the Battle: Los Angeles layer through your mobile phone.

Once you launch the layer, you’ll see alien commanders and battle drones, but there are also alien command centers attacking US capitols and landmarks. If you see one, take a screenshot and share it on Twitter or Facebook to warn others.

… Ok, so there isn’t really a threat in “physical reality,” but there is a very serious alien invasion happening on Layar as a fun and interactive way to promote the film Battle: Los Angeles‘s Blu-ray/DVD/iTunes release on June 14.

The Battle: Los Angeles layer was a creative collaboration between Sony Pictures and Layar Partner Zehnder Communications, and it’s a great example of how to integrate Augmented Reality into a multi-platform digital marketing campaign.

The layer includes several multimedia options in the actions menu, allowing users to launch movie trailers and sneak previews, enter a sweepstakes to win a PS3, and purchase/pre-order the movie on Amazon.

It also highlights some Layar 5.0 features, including social sharing of screenshots, high-quality 3D models and both locative and dynamically generated POIs (aliens and droids appear near you no matter where you are, but command centers are only visible at specific locations, like over the White House, for example).

Check out this ultra cool promo video highlighting the Layar integration:

For more ways to survive the alien invasion (and possibly win prizes in the process), visit the Battle: Los Angeles website, “like” its Facebook page or follow @BattleLA on Twitter.