Janus groaned a little and sat up, rubbing his head. They questioned him eagerly. "Maybe I didn't see it," he muttered. "You wouldn't believe me anyway. Gravity's normal, so let's get out of here." And when they pressed their questions, he only shook his head stubbornly. Heedless of their aching muscles, they zipped out of the bulging suits. Mark's hand went instantly to an inside pocket near his heart, where he'd placed his secret flat box with the lenses. He was relieved to find that it, at least, was undamaged. * * * * * Janus was breaking out the weapons. He handed each of them an atomic rifle and neutro pistol. Brownell had taken a sample of the atmosphere and announced it was fit for them. They debarked onto a plain where lush yellow grass sprang waist high. "Strange," Brownell was muttering. He stared back the way they had come. Only a few yards behind them was the twilight zone! It was sharply defined, gray and misty, reaching sheerly up. Yet they stood in bluish daylight which extended ahead of them to the sharp, downward curve of the horizon. Brownell walked slowly back to the twilight zone, gingerly testing the gravity. He entered the zone--and fell flat to the ground! Janus leaped to him, dragged him back. "Did you ever see such a thing?" Brownell exclaimed as he rose. "Not only is there a sharp division of light and dark, but half the planet is terrifically heavy while the other half is normal. It defies all laws as we have known them." Janus was peering intently into that grayness--toward the edge of the forest a hundred yards away. Suddenly he gripped the Professor's arm. His voice came a little hysterically. "I wasn't dreaming, then. I see it! There it is--the thing that grabbed our ship! Don't move, you men, because I swear--it's watching us!" Gradually they made it out, as they stared in the direction of Janus' gaze. It was a huge bulking shape that towered above the tallest trees. A roughly round, metallic body that rested on four jointed metal legs. Metal arms, too, dangled at its side. "A robot!" came in a whisper from Dethman's lips. "A metal robot, but good Lord--look at the size of it!" They were looking. Fifty feet above the ground they could make out its head, semi-spherical--and there were two eyes glowing with a greenish light, eyes that must have been large as dinner plates! It stood quite motionless in the gloom near the forest, watching them. "That's the thing that towed us here?" Brownell whispered. "Yes! I just got a bare glimpse of it." "Must be friendly, then. But I wouldn't want to shake hands with it! The thing does seem to be watching us, doesn't it?" "I'll fix it!" Ferris suddenly brought his rifle up, took aim at the glowing eyes. Janus whirled, knocked the rifle aside. "You fool! That's an intelligent entity, I tell you! Want to get us killed?"