Orion by Ben Bova

Softcover. Condition: Very Good. 1984. A Fireside book. 1st in Orion Series.

Some shelf wear

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.