The film focuses on a former Union Army lieutenant (Costner), who travels to a military post on the American frontier, before meeting a group of Lakota Sioux, with whose culture he becomes fascinated.
Film tersebut berkisah tentang seorang mantan letnan Union Army (Costner), yang mendatangi pos militer di garis depan Amerika, sebelum bertemu sekelompok Lakota Sioux, yang membuatnya terbius dengan budaya mereka.