Edgar Rice Burroughs' John Carter of Mars

After ten years away from Mars, John Carter is finally able to return and finds himself in the Valley Dor, where every Martian comes at the end of life. When savage plant men attack three Tharks John is able to save one, who coincidently is an old friend, Tars Tarkas. John and Tars escape the plant men through a passage that leads them into the city of the Therns. There they rescue a slave girl, Thuvia, and learn the Therns are being raided by the Black Pirates of Omean, who have captured Dejah Thoris, John's wife on Barsoom.