In this debut issue, we meet Devil Dinosaur, a bright red dino, presumably a T. Rex (although Kirby wisely doesn't use actual dino names), and his young companion, Moon-Boy of the Small-Folk, residents of the dangerous Valley of Flame, a heavily volcanic area. After a battle with Thunder-Horn, Moon-Boy remembers how he first met Devil, when the Killer-Folk killed Devil's family and seared his flesh, and they rescued each other. After that, Moon-Boy's people fled in fear of Devil, while the Killer-Folk plot revenge.
This all works a lot better in comics form, of course, and later issues got even weirder, as Kirby threw in science-fiction concepts with wild abandon.
Mike Royer inks the story, Frank Giacoia inks the cover and Kirby also writes a text page introducing the series.