Lucero's robot took a step forward tentatively and then gazed questioningly at its mistress, and suddenly a wave of energy from the Panadur stopped it dead in its tracks.

"The agreement will be honored," Mark acquiesced, "but one has escaped, O Panadur, and Klonos knows where in that maze of rocks and caverns he's now hiding with his super-robot."

"That's our problem, Terran. The agreement was five-hundred, and five-hundred scientists shall we have."

"You will need the fifteen robots immediately," Mark said thoughtfully. "Lucero, my dear, only you can command the robots, so place fifteen under the Panadur's command ... are you able to walk?"

"Of course, I was only stunned." She rose from the couch and left the compartment followed by her ever-watchful metal man. The Panadur seemed to melt away as it glided into the hall.

"And now," Mark addressed Palanth, "we must begin to land the spacers, I have the radio beam. The sooner everyone has been given the sleep-freeze antidote, the better. Internationals first, they are our best fighters, just in case the Council has another trick up its sleeve. Then we must find some way of increasing the spacers' resistance to the disintegrating beam—the alloy used on robots' case shell is the clue—they're impervious to atom-blast. Weather stations next—robots to be detailed on that and machinery stations to turn out mechanical robots and more machinery ... tools, weapons for defense ... we're really fighting for time."

"I know. But even then, I can think of nothing that can stop Terra's fleet if it ever comes to Europa. It's practically invulnerable, or Venus and my own Mars would have shaken off the Council's domination long ago!"

"I have an idea Palanth! It's far from clear, but if it works.... It has to do with radiant energy—even the Fleet couldn't withstand that."

"Radiant energy! Have you lost your mind? Who can control a radiant energy vortex? Besides, we have no means of releasing it. Stop dreaming Mark!"

"It isn't a dream," Mark shrugged wide shoulders. "But come, let's take a look at the scientific exodus—I'm certainly glad to be rid of them, hope the Panadurs can cope with that tribe."