Wildfire (1986)

Sara, a 12-year-old living on a Montana ranch, was whisked away to the other-dimensional land of Dar-Shan by the talking horse Wildfire. Here Sara found she was really a princess, sent to the mortal world during infancy to protect her from villains. An amulet Sara wore around her neck both protected her from harm and gave her supernatural powers. Wicked sorceress Diabolyn wanted the amulet, and this was where the plotline took off. Assisting Sara in warding off Diabolyn and regaining the throne of Dar-Shan were Wildfire's equestrian companions Dorin, Brutus, and Alvinar.