Beneath the vast and trackless Sahara there lies a cavern so immense the whole nations could be swallowed up within it. There reside in the eternal subterranean glow the last of the Cro-Magnons and their rivals the Neanderthals, lost remnants of ancient surface empires, and hordes of beasts and beings from all the ages of prehistory.Into this world, Zanthodon, penetrated the soldier-of-fortune Eri...