Genesis!

Renzu was mad, certainly! From Venus' lifeless clay he dreamed of moulding a mighty race; a new Creation, with himself as God!
The unreal silence of outer space closed in about The Traveler . In front of the huge atom-powered space rocket hung the sun's dazzling disc and behind the pale, silver face of the earth echoed the light. Captain Vic Arlen was a god in the heavens; Dave McFerson, the engineer, was a demi-god. And what was Harry Renzu? It was hard to call a great scientist a devil.
There was Gheal—neither god nor devil, only a poor, hideous, half-human slave that had been brought with Renzu to the earth from a previous expedition to Venus. Captain Arlen quit trying to classify himself and his passengers. They were neither gods nor devils. Not even men, taking the group as a whole.
An ominous chill seemed to reach through the beryllium hull of the ship from outer space, caressing Arlen's backbone. A faint cry sounded in the passageway that led to the sleeping quarters behind the control room.
The captain tripped the controls into neutral. The acceleration was complete and from now until the braking rockets were fired, the craft would follow its carefully calculated orbit.
Again came the cry, a groan of pain and a moaning sob. The captain strode into the passage.
Gheal! he called, recognizing the Venusian's hoarse voice. Gheal! What's the matter?
A repetition of the cry was the only answer. The passageway was open, but the sobs seemed to be coming from the cabin of Harry Renzu, the scientist who had chartered the moon rocket for his second expedition to Venus.
The captain paused before the cabin door, listening. The cry came again and he pushed open the door.
The hideous Venusian was on the floor, looking upward with his two light-sensitive eye-glands at Renzu, who stood over him with an upraised cane.
Gheal's rubbery, lipless mouth was agape, revealing his long, sharp teeth. He had raised one of his long, rope-muscled arms to catch the descending blow. His hairless, leathery body trembled slightly with pain.