Ex-Confederate Army captain John Carter finds himself suddenly and unwittingly transported to Mars while fleeing Apache Indians. This new world is populated by a race of monstrous Martians whose culture is based on the ability to fight for their race. Captured by the savage green men of Thark, John discovers that the gravitational difference between Mars and Earth has endowed him with the strength that he will need for survival on this hostile planet. He battles ferocious Martian creatures and gains the respect and friendship of the Barsoomians. Along the way he encounters the beautiful Dejah Thoris Princess of Helium, and earns her everlasting devotion.