Presently the Panadur Leader raised his delicate face, the brilliance of his eyes increased as he turned to face the tunnel that led to the cavern's entrance, then the single thought flashed out: "_Enter!_" It wasn't long until the silence was broken by the tread of heavy-shod feet crunching the glittering oxide crystals, and Mark entered followed by Palanth. The awful responsibility for three-hundred million lives and the transfiguration of a world, had left its mark on the faces of the two men. "We bring bad news, Panadur!" Mark said bluntly, in his preoccupation he unconsciously resorted to speech. "One of the space vessels has been looted of vital supplies that can be used for the construction of an interplanetary radio. Verdugo took the opportunity to steal its radio installations with the aid of his robot, while the passengers celebrated their arrival on Europa. If Verdugo builds a Tele-Magnum and contacts the Council, it means War!" "And war," Palanth seconded, "means the Terran Fleet, against which we are not prepared!" "When were the supplies stolen?" "Three revolutions of Panadur on its axis ago--we learned of it today. Enough time for Alcoran to have built an instrument powerful enough to contact the Council on Venus." "The blame is partly ours," the Panadur telepathed sadly. "We should have captured Verdugo long ago. But it meant wasting lives to imprison that madman ... but now, we have no recourse, the scientist and his metal servant will be brought in. It will solve another problem," he added thoughtfully. "This!" He indicated the trepanned cranium of the scientist on the operating table. "If you need them, Panadur, you may have every robot in our possession," Mark offered. For an instant the nearest thing to a smile the two men had ever seen, crossed the features of the strange being of Europa. "Panadur thanks you, Terran. But we already have built over a thousand robots, half of them have mechanical brains and can be radio-controlled, but the other half, the important one requires a knowledge of Verdugo's technique for transplanting organic brains to metal men. He shall provide that ... personally!" "Once long ago," Mark spoke meditatively, "you slew an enemy of mine with a volume of energy like a bolt of lightning, then you somehow transferred the latent energy of that being to me. _Could that have been radiant energy?_" He paused. "Could it, O Panadur?" But the Europan had abruptly interposed an impenetrable barrier between his mind and that of the two men. With an imperious gesture he pointed to the exit of the cavern. Mark and Palanth gazed at each other in bewilderment, finally they left in silence. As soon as they were lost to view, the cavern began to be filled by a steady stream of thousands upon thousands of silvery Panadurs silently filing in from the inner caverns. * * * * *