Meet the neighborhood watch: civic-minded Evan (Ben Stiller), fun-loving family guy Bob (Vince Vaughn), tough-talking “wild card” Franklin (Jonah Hill) and the looking-for-love divorcé Jamarcus (Richard Ayoade). In a seemingly serene suburban enclave and safe haven, Evan Bob, Franklin and Jamarcus have decided to join forces to safeguard their community. In addition, they’re enjoying some of the perks that come with being a “Watcher”… like drinking beer and just being guys.
But when the guys’ patrol vehicle hits something that leaves behind a trail of green goo and a tentacle of some sort, and they find a strange, bowling ball-like device that emits a concentrated beam of energy – they realize that their little group has stumbled onto something bigger than a prowler on the loose.