Escape Across the Cosmos by Gardner Fox
Paperback Library, 1964
Price I paid: 90¢
Falsely accused of depriving the Empire of its dream of a Promised Land by murdering its Leader, Kael Carrick was exiled to the dread planet Dakkan, a galactic graveyard from which no man returned.
But Kael had to return. He alone could dare attempt it. For before his death, the Leader had rebuilt Kael’s war-ravaged body into a cybernetically perfect specimen—a silicon superman potentially capable of destroying the devouring terror of the Slarrn world that now hungered for the Empire.
Kael’s powers were extraordinary—so much so that he hesitated to test them. But test them he must. For on his courage and strength alone depended the fate of the Empire, and its last chance to learn whether Paradise or Evil awaited them somewhere in the cosmic vastness.