Donovan stared at his report with tired eyes. "Greg, we've underproduced by one thousand tonnes.' He pushed his hands through his wild red hair. "If it weren't for the money I'd resign. I'm so tired of working with crazy new robots. Greg Powell jumped at Donovan's wild shout and they both stared at the screen on the wall. They've gone completely crazy!" Donovan whispered. "Get your suit on. We're going out there," Powell said. The robots were marching, their metal bodies shining against the dark rocks of the airless asteroid. Dave marched in front, and the six subsidiaries followed him, each robot close to the one in front. They stopped, turned and marched again, each one keeping in perfect step. "They're absolutely mad Donovan said. "They're marching like soldiers. Perhaps they're practising for a war"We don't know what they're doing," Powell said coldly. "Think first, and don't speak afterwards, either." Donovan frowned and slid a gun into the belt of his suit. Slowly, they walked through the darkness towards the robots. They tried to reach Dave by radio but the robot didn't answer. Let's get up on that rock so that we can watch them carefully. They're marching this way Donovan jumped. Gravity on the asteroid was lower than it was on Earth, but with a heavy suit it was quite a big jump. Powell followed. The robots marched towards them. But suddenly, when Dave was about six metres away from the humans, he stopped. The subsidiary robots stopped, too and then they moved away rapidly. Dave watched them for