Orion

"Never-stop action and mind-bending concepts combine" in this science fiction adventure from a Hugo Award–winning author (Issac Asimov).

John O'Ryan is not a god . . . not exactly. He is an eternal warrior destined to combat the Dark Lord through all time for dominion of the Earth. Follow him, servant of a great race, as he battles his enemy down the halls of time, from the caves of our ancestors to the final confrontation under the hammer of nuclear annihilation.