Yup, it's another sequel with a "D" stuck on the end. It's getting to where Hollywood will green-light any film so long as it's the third one and they can make it in 3D. (So where's Gremlins 3D, geniuses?) At least gore-loving director Alexandre Aja (Haute Tension, The Hills Have Eyes) has the good sense to camp this one up a bit. Richard Dreyfus, Ving Rhames, Elisabeth Shue, Jerry O'Connell and Christopher Lloyd are among the adults trying to save hard-partying college kids (like porn star Riley Steele) from becoming fish food at Lake Havasu, Arizona. 88 minutes R.