Lieutenant Lloyd spotted the first alien in the ruins of the strange red Martian city on the second day of exploration. His first impulse was to call out to the other men—but then, afraid his voice would startle the creature down at the end of the rubble-strewn street, he silently unholstered his military service pistol and crept forward toward the back (he hoped it was the back) of the alien, his breath rasping behind his faceplate. He was a mere ten paces short of his goal when loose gravel be