The Watch

The Watch is a movie starring Ben Stiller, Vince Vaughn, and Jonah Hill. Four men who form a neighborhood watch group as a way to get out of their day-to-day family routines find themselves defending the Earth from an alien invasion.
Four everyday suburban guys come together as an excuse to escape their humdrum lives one night a week. But when they accidentally discover that their town has become overrun with aliens posing as ordinary suburbanites, they have no choice but to save their neighborhood - and the world - from total extermination.