Orion Series 1-5 Ben Bova

Orion: A Novel 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.

Vengeance of Orion Orion finds himself thrust back to the ancient world of Greece and must prevent the Greek army from destroying the citadel of Troy. If he fails, he will lose the only woman he has ever loved. But if he succeeds, the history of the world will be changed forever. The stunning sequel to Orion.

Orion in the Dying Time A sequel to "Orion" and "Vengeance of Orion". At the end of the Cretaceous Period, Earth is in the grip of the dinosaurs. Their leader is a reptile, worshipped by the Egyptians as a powerful god for thousands of years. His mission is to destroy the Creators - Orion's masters - and rule the planet.

Orion and the Conqueror John O'Ryan is Orion-more than human, less than a god, cast away on the seas of Time to do battle among the Creators for the future of mankind. Now the eternal warrior finds himself separated from his great love, Anya, and marooned in Macedonia under the reign of Phillip-fighting alongside the young Alexander, and at the mercy of a Queen Olympias who is far more than she seems.

Orion Among the Stars Orion, who is sent by Aten to fight in wars throughout the vast continuum of space and time, is now a soldier in an intergalactic war, commander of a troop of cloned humans whose sole reason for existence is to serve the rest of humanity as cannon fodder. Gradually, Orion realizes that just as these clones are pawns in a fight that's not really theirs, he is a pawn of Aten and the Creators. As his power and independence develop, Orion realizes that all the wars in which he fights are battles in an epic conflict among the Creators. He is contacted by the Old Ones, an ancient race which threatens to destroy the younger, sentient species if they do not cease developing their ultimate weapon of destruction.