In Glenview, Ohio, four pals, Evan, Bob, Franklin and Jamarcus, form a neighborhood watch group. Armed with flashlights, walkie-talkies and spiffy new jackets, the guys try to take their mission seriously, even if they spend a little time goofing off now and then. But when they discover aliens living among them and no one believes their story, they learn that they have to kick things up a notch to save the world from annihilation.