Scott Glenn, Adam Beach, Michaela McManus and Kelly Curran have rounded out the cast of David Hackl’s “Red Machine.”Thesps join James Marsden, Piper Perabo, Thomas Jane and Billy Bob Thornton in the film from Indomitable Entertainment and Paul Schiff Prods. Pic centers around two estranged brothers (Marsden, Jane) who reconcile on a camping trip with their girlfriends. Once in the remote wilderness, however, things go horribly awry when they are attacked and relentlessly stalked by a horrifying grizzly bear — the Red Machine. “Saw V” helmer Hackl will direct from a script by J.R. Reher. Paul Schiff, Tai Duncan and Hadeel Reda will produce. Indomitable’s Dominic Ianno and Stuart Pollok exec produce.