John Carter, a Confederate veteran of the Civil War, searches for gold and finds something he never imagined.
When he strikes a rich vein of gold, the local Apaches turn against him. Desperate to escape, Carter hides in a sacred cave and is transported to Mars. On this new world, Carter has great strength and nearly superhuman agility, which make him a valued member of the Tharks, a nomadic tribe of Green Martians.
But when the Tharks capture Dejah Thoris, the Princess of Helium, and a member of the humanoid red Martians, Carter begins to question his role on Mars. He is determined to return Dejah Thoris to her people, but in time it becomes clear that Carter must lead a horde of Tharks. With Carter’s loyalty tested to its limit, this victory or defeat will determine the fate of Dejah Thoris as well as the whole of Mars itself.