The World of Tiers, Volume 1


Philip José Farmer - 1965
    Paul J. Finnegan, also from our contemporary world). Separately and together, the two heroes contend against the Lords who rule the separate universes, of which the marvelous many-leveled World of Tiers is the center. Mythological and legendary creatures and characters abound: centaurs and harpies, mermaids and Indians, aliens and beautiful women.

Triplanetary


E.E. "Doc" Smith - 1948
    The Arisians, using advanced mental technology, have foreseen the invasion of their galaxy by the corrupt and evil Eddorians, so they begin a breeding program on every planet in their universe. Their goal...to produce super warriors who can hold off the invading Eddorians.