Hex

Hex is a 1973 American horror film filmed on Cheyenne River Indian Reservation starring Keith Carradine, Dan Haggerty, Gary Busey, Hillarie Thompson and Christina Raines (billed as Tina Herazo). The film was initially publicized under the title Grass Land. According to Phil Hardy's The Encyclopedia of Horror Movies, Hex "crosses elements of the bike film with those of the post-western and the supernatural tale... The film scarcely succeeds in welding its disparate elements together, but still makes a distinctive, atmospheric impression."