A Princess of Mars
The film is largely based on "A Princess of Mars" (1917), the first in a series of 11 novels by Edgar Rice Burroughs to feature the interplanetary hero John Carter (and in later volumes the adventures of his children with Dejah Thoris). The story was originally serialized in six monthly installments (from February through to July 1912) in the pulp magazine "The All-Story"; those chapters, originally titled "Under the Moons of Mars", were then collected as a novel and published in hardcover five years later from A. C. McClurg.