At first he did not know what it was, but he leaped at it. It turned, snarling. There was air in the ship and he wondered about that. He did not have time to wonder. The thing was like some monstrous, misshapen creature, a man--yes, but a man to give you nightmares. Bent and misshapen, gnarled, twisted like the roots of an ancient tree, with a wild growth of beard, white beard, heavy across the chest, with bent limbs powerfully muscled and a gaunt face, like a death's head. And the eyes--the eyes were wild, staring vacantly, almost glazed as in death. The eyes stared at him and through him and then he closed with this thing which had felled Diane. It had incredible strength. The strength of the insane. It drove Ralph back across the cabin and Ralph, encumbered by his spacesuit, could only fight awkwardly. It drove him back and it found something on the floor, the metal leg of what once had been a chair, and slammed it down across the faceplate of Ralph's spacesuit. Ralph staggered, fell to his knees. He had absorbed the blow on the crown of his skull through the helmet of the suit, and it dazed him. The thing struck again, and Ralph felt himself falling.... Somehow, he climbed to his feet again. The thing was back over Diane's still form again, looking at her, its eyes staring and vacant. Spittle drooled from the lips-- Then Ralph was wrestling with it again. The thing was almost protean. It all but seemed to change its shape and writhe from Ralph's grasp as they struggled across the cabin, but this time there was no weapon for it to grab and use with stunning force. Half-crazed himself now, Ralph got his fingers gauntleted in rubberized metal, about the sinewy throat under the tattered beard. His fingers closed there and the wild eyes went big and he held it that way a long time, then finally thrust it away from him. The thing fell but sprang to its feet. It looked at Ralph and the mouth opened and closed, but he heard no sound. The teeth were yellow and black, broken, like fangs. Then the thing turned and ran. Ralph followed it as far as the airlock. The inner door was slammed between them. A light blinked over the door. Ralph ran to a port hole and watched. The thing which once had been a man floated out into space, turning, spinning slowly. The gnarled twisted body expanded outward, became fat and swollen, balloon-like. It came quite close to the porthole, thudding against the ship's hull, the face--dead now--like a melon. Then, after he was sick for a moment there beside the airlock, he went back for Diane. * * * * * They were back aboard the Gormann '87 now, their own ship. Ralph had revived Diane and brought her back--along with the other Gormann's radarscope--to their battered tub. The bruise on her temple was badly discolored and she was still weak, but she would be all right. "But what was it?" Diane asked. She had hardly seen her attacker.