Director Sam Raimi (Spider-Man) and producer Bill Block (District 9) are joining forces with Warner Bros. to develop a film based on a script from Air Force One screenwriter and Castle executive producer Andrew W. Marlowe, about Earth’s response to an imminent alien invasion. The film is titled EDF (or Earth Defense Force).

Description via NYMag:

In EDF, we open on a U.S. military operation gone awry: Sent to rescue what they believe is a sub that’s accidentally bumped into a mine in Chinese waters, U.S. naval aviators quickly wind up engaged in a dogfight with a squadron of Chinese air force pilots. Soon, planes on both sides are being shot out of the sky, but not by the Chinese or US pilots, but by three alien attack fighters, which soon depart and destroy many of the world’s landmarks and military installations, then, vanish. It’s a test of Earth’s defensive capabilities, and we failed. Shortly after, NASA detects a radiation signature in a nearby galaxy, indicating a far more massive attack coming in about ten months, and world leaders set about trying to create super-aircraft and weapons that can fight off the coming invasion.

No production date has been set.