In 1823, Hugh Glass guides a group of trappers belonging to Andrew Henry in the disorganized northern territory of Louisiana when they are suddenly ambushed by a group of Arikara Indians, who are robbed of the fur they were carrying. However, some manage to escape. Among the survivors, Hugh, the only man who knew the route back, is mortally wounded by a bear attack. Seeing the enormous difficulty of carrying a dying man and, in addition, in the harsh winter, Andrew is forced to leave him in the forest with Glass's indigenous son, Hawk and two of his men: young Jim Bridger and ex-military John Fitzgerald