Strange, dumb, and sometimes even fun, the seventh and last installment in Lionsgate’s torture-porn franchise would have been just as dull and pretentious as its six predecessors if it had been competent, but its deficiencies make it the series’ most enjoyable entry. A self-help phony, a cop-turned-serial-killer, an internal affairs officer, and the wife of a different serial killer all figure in the convoluted plot, but the movie has so little sense of space, time, pacing, or characterization that they might as well be anonymous people; in its Grand Guignol gauntlet of flashbacks and 3D dismemberments, who’s doing what to whom, or why, doesn’t really matter. This is probably better (or at least weirder) if you’re unfamiliar with the series. Kevin Greutert directed.