After crash landing on a primitive and barbaric planet, Earth astronaut Alan Green becomes a slave to the Duke of Tropat and paramour to the duke’s termagant wife, all while married to a gorgeous slave woman named Amra. Green has one daughter with Amra, but her other three children are each from different “owners” who bought and sold her over the years.

When Green learns that two Earthmen recently landed near the distant city of Estorya and were taken prisoner as “demons,” he strikes a deal with a trader, Miran, to hide aboard his ship on his next voyage across the vast, grassy plain of Xurdimur. For on this world, boats travel not only by sea, but also over land using a series of large wheels.

It is Green’s plan to free the imprisoned Earthmen before they are executed during an upcoming festival, then return with them to Earth aboard their ship.

After a perilous escape from the duke and duchess, Green disguises himself as a monk and boards Miran’s ship—only to be confronted by Amra and her children, who he had planned to leave behind for they would never be able to adapt to life on Earth.

During their trek across Xurdimur, Miran cleverly evades an attack by pirates, but a day or two later, his ship collides with one of the fabled roaming islands that levitate across the plains of their own volition. Many of Miran’s crew are killed in the crash. Most of the survivors are slaughtered shortly after by the savage cannibals inhabiting the island. Although wounded, Green evades capture, but is separated from Amra and the children. He soon learns that they were imprisoned by the natives.

No sooner does he rescue them than Green encounters a disheveled Miran who also survived the collision. In the middle of the night, they manage to steal a smaller boat from the island and continue across the plain to Estorya. Will Green be able to liberate his fellow Earthmen before Miran betrays him to the authorities? Will their ship be undamaged and able to depart this godforsaken world and if so, will there be enough room for Amra and the children?

The Green Odyssey was Philip José Farmer’s first novel-length publication and is more fantasy-adventure than science fiction. While the setting has a few unique elements, the characters are two-dimensional. Overall, the story is reminiscent of the Barsoom novels of Edgar Rice Burroughs and seemed to be a precursor to Jack Vance’s Planet of Adventure series in which an Earth astronaut named Adam Reith crash lands on a barbaric alien world named Tschai and after acquiring several companions, ventures off across the planet to find the means to return to Earth.