The series is an overlapping of planetary romance and sword and planet. The first book, "Tarnsman of Gor", opens with scenes reminiscent of scenes in the first book of the Barsoom series by Edgar Rice Burroughs; both feature the protagonist narrating his adventures after being transported to another world. These parallels end after the first few books, when the stories of the books begin to be structured along a loose story arc involving the struggles of the city-state of Ar and the island of Cos to control the Vosk river area, as well as the struggles at a higher level between the non-human Priest-Kings and the Kurii (another alien race) to control Gor and Earth.