In the ceiling of our lab compartment there was a circle, still edged with the rough scale of a tool cutting with intense heat, and there was a hinged, circular door of metal. They had cut through the skin of our ship, and had installed an airlock, quite like our own variety in principle, yet so tiny that our human eyes had missed it entirely. Helplessly we were drawn through it, and onward into the murky night of Ganymede, over which Jupiter and his other scattered moons held sway. Our robot-selves of course did not feel the cold, which approached absolute zero. Nor apparently did our unarmored hosts. Nor did they seem compelled to breath oxygen. "Charlie! Doc!" I heard Jan call. "I hope they're not taking us too far! The radio control hoods, keeping us in contact with our micro-robots, here, are of limited range. We could lose the robots!..." "Not very far," came the answer from the being who had spoken before. "But Kobolah--myself--says it makes no difference to you." Perhaps that strange little monster meant to reassure us. By now I had him identified as an individual. The irregular filaments around his eyes were longer and paler than those of his henchmen. A Ganymedean wind wafted us along, our escort perhaps using it to cover distance, righting it only as much as necessary, with their spitting jet-tubes. Our course turned downward into the shadows of knotty rock masses near the old Xian camp. We went through another airlock, and into a tapered, cylindrical chamber. Figures like the others were there, craggy, yet obliquely charming in form. There was what must have been a propulsive mechanism, perhaps refined by ages of development, until matter was totally converted to energy. And there was a crystal vat in which complicated grids were suspended in gelatin. Deep in the menisculous, pearly medium were shapes, hardly seen, though suggestive. Kobolah spoke again: "You three even built small robots with great pains to pay us a visit. So we thought that maybe you should truly come. We shall see...." I saw that odd, triangular head. I could fathom nothing from the eyes, except perhaps a cold interest. But I felt tricked and trapped. As far as our senses were concerned, we were here, not back in our ship. Forgetting that, we had been off-guard there! Can a robot have a fearsome headache? Suddenly I had one. Dizziness and a blurring of consciousness was followed by panic. Suddenly I was back in the _Intruder_, frantically unfastening the helmet of my space armor, then casting off the control hood. I staggered erect. Dr. Shane Lanvin grunted beside me. His usually mild face was contorted. Jan gave a thick cry, her gloved hand on her brow. Doc and she had also torn off their helmets and hoods. I floundered to Jan, heard her say, "Charlie...." Then I saw a hole, like a tiny cigarette burn, at the fabric-and-wire elbow joint of my armor's left arm.