Through ore, rock, and soil they sped; straight to the bodies of all the men aboard one selected vessel of the Terrestrials. As each group of beams struck its mark one of the crew stiffened momentarily, then settled back, apparently unchanged and unharmed. But the victim was changed and harmed, and in an awful and hideous fashion. Every motor and sensory nerve trunk had been severed and tapped by the beams of the thinkers. Each crew member's organs of sense now transmitted impulses, not to his own brain, but to the mechanical brain of a thinker. It was the thinker's brain, not his own, that now sent out the stimuli which activated his every voluntary muscle. Soon a pit yawned beneath the doomed ship's bulging side. Her sealed air-locks opened, and four hundred and ten automatons, with their controllers and other mechanisms, entered her and concealed themselves in various pre-selected rooms. And thus the _Dresden_ took off with her sister-ships--ostensibly and even to television inspection a unit of the Fleet; actually that Fleet's bitterest and most implacable foe. And in a doubly ray-proofed compartment the ten thinkers continued their work, without rest or intermission, upon a mechanism even more astoundingly complex than any theretofore attempted by their soulless and ultra-scientific clan. CHAPTER II _Hater of the Metal Men_ Ferdinand Stone, physicist extraordinary, hated the robot men of metal scientifically; and, if such an emotion can be so described, dispassionately. Twenty years before this story opens--in 2991, to be exact--he had realized that the automatons were beyond control and that in the inevitable struggle for supremacy man, weak as he then was and unprepared, would surely lose. Therefore, knowing that knowledge is power, he had set himself to the task of learning everything that there was to know about the enemy of mankind. He schooled himself to think as the automatons thought; emotionlessly, coldly, precisely. He lived as did they; with ascetic rigor. To all intents and purposes he became one of them. Eventually he found the band of frequencies upon which they communicated, and was perhaps the only human being ever to master their mathematico-symbolic language; but he confided in no one. He could trust no human brain except his own to resist the prying forces of the machines. He drifted from job to position to situation and back to job, because he had very little interest in whatever it was that he was supposed to be doing at the time--his real attention was always fixed upon the affairs of the creatures of metal.