With the star-power involved in this movie (Dennis Hopper, Lance Henriksen, Dina Meyer, and Jeff Fahey!), you might be tempted to sit down and watch it.
Resist that temptation.
Hopper does his best William Shatner imitation, only louder with a dubious "southern" accent. Henriksen seems to be in a walking coma, presumably since discovering what he'd gotten himself into here. Meyer's psychologist is "caring" to the point of inducing nausea. Fahey, unlike in some of his past efforts, will make you believe that trees can talk.
That brings us to writer / actor Pavan Grover, who comes across like a male model who wandered onto the set. He plays "Mowatt'", a serial killer with psychic powers. Powers I say! Alas, he looks too much like Rambo in an Elvis wig to be taken seriously.
UNSPEAKABLE is unendurable, inexcusable, and probably fattening...