Manny Tamayo's new play for Factory Theater--a convoluted parody of 1970s horror films in which government-created humanoids steal people's souls and contaminate their drinking water--is not only confused but bloated with unnecessary characters and dead scenes. Nick Digilio's elemental staging creates traffic jams anytime more than 6 of his 25 cast members are onstage at once. But only a neophyte would expect theatrical cohesion from the impudent, vulgar, ingeniously adolescent Factory, known for raising bodily-function humor to giddy heights. When Tamayo focuses on the hyperbolically dysfunctional family at the play's center, the result is the kind of bratty, whip-smart evisceration of middle-class propriety that's given the Factory's 14-year frat party its long, disarming run. --Justin Hayford a Through 12/16: Fri-Sat 8 PM, Sun 7 PM, no show Fri 11/24, Prop Thtr, 3502-4 N. Elston, 866-811-4111, $20.