There is a certain sub-genre of science fiction that is sometimes called “sword & planet”. It has its roots in A Princess of Mars and other tales of John Carter on Barsoom by Edgar Rice Burroughs. The hallmarks are an alien world filled with decadent science, barbaric warriors and an outsider from earth who shakes up the scene.
Robert E. Howard of Conan fame made his own foray into the field with Almuric, perhaps his most extended science fiction work. In fact Almuric is one of REH’s few novels (it was serialized in Weird Tales but never issued as a novel until the ‘70s). The hero is Esau Cairn, a man too strong for civilized life. When fate puts him outside the law a kindly scientist helps Cairn out with a dimensional transporter that shoots him to Almuric, a planet remote from earth. The inhabitants are shaggy ape-men and gorgeous barbarian princesses. On Almuric, a fellow is judged by his courage and strength, not his bank account so Esau Ironhand fits right in.
Alas, there is always a hitch. The demonic Yagas, a race of winged fiends, tyrannize over Almuric. When they massacre Cairn’s friends, it means war.
While not as well developed as the Hyborian Age, Almuric is an entertaining imaginary world. I enjoyed the naïve and romantic story telling of A Princess of Mars. In Almuric we get REH’s take on that style of story telling: bold, direct, and swashbuckling.