Originally known as Neighborhood Watch but hastily retitled after the Trayvon Martin shooting, this listless sci-fi comedy sticks to the formula of such recent Ben Stiller offerings as Tropic Thunder (2008) and Tower Heist (2011), with Stiller as the forehead-slapping commander of an oddball crew (Vince Vaughn, Jonah Hill, and British comedian Richard Ayoade). Aliens have infiltrated their little Ohio suburb, so the four stars man up to patrol the streets every night. Much of the action takes place after hours in the Costco managed by Stiller’s character, but the laughs are not available in bulk. Akiva Skaffer, best known for his digital shorts on Saturday Night Live, directed a script worked over by Seth Rogen and Evan Goldberg; with Rosemarie DeWitt, R. Lee Ermey, and the inevitable Will Forte. The Watch opens wide on Friday; a trailer follows.