Pretender

The craft was in trouble. And the alien entity known as NK-2 was headed for an unscheduled landing on a backwater planet named Earth. To make matters worse, his enemy had reached the ground before him, and by now was probably already hidden among the primitive people of this place, a race of two-legged beings who called themselves the Babylonians. And now his host animal was dying, and unless he found another creature intelligent enough to take its place, he was doomed. If the enemy didn't get him first!