Clustered upon the wheeled platform was an assemblage of intricately winding coils, glowing tubes, and other apparatus that conveyed no more meaning to Blake's bewildered gaze than a sight of the interior of a metropolitan power-house would to a Congo savage. * * * * * There was only one piece of the apparatus regarding whose probable function Blake could even guess. This was a pair of long slender arms that projected through the shimmering walls into the enclosure, supporting at their end a large thin metal plate located just over the heads of the three Earthlings. Blake was willing to wager that it was this overhead plate that was responsible for the odd paralysis that held them helpless. Then a figure came slowly into view from where it had been concealed by the apparatus, and Blake forgot all thought of the strange mechanisms as he watched the monstrous thing clamber stiffly from the platform and halt squarely in front of the captives to stare at them through the transparency of the intervening force sheet. The thing was a curious blending of human and bestial features. It stood barely five feet in height, yet its great scale-armored skull was at least three times as large as that of a grown man. There was colossal mental power and nameless evil glowing in the dark depths of the two abnormally large eyes that stared fixedly out from under the heavy forehead. The thing had no nose. The mouth opening, surrounded by a rosette of flabby gray skin, was a mere slit. The entire skull and face were covered with small, closely overlapping scales of lusterless gray. The head merged directly into a short black torso nearly as wide as the skull itself. From this trunk there writhed a score of long black snake-like tentacles, each terminating in a flexible three-fingered "hand." The trunk was supported by two short thick legs, armored with gray scales, and ending in broad three-toed feet. "Greetings, Earthlings!" The voice that emanated from the grotesque mouth was surprisingly resonant in tone. "Allow me to present myself. I am Zehru, imperial scientist of Xollar." * * * * * The monstrosity seemed amused at the expressions of blank surprise upon the faces of his captives. "I learned your crude language from your brain cells while you slept under the red ray," he explained. "Also I learned many other things regarding your planet, Earth. I am glad to find your world so well adapted to my purpose. Within a few years after my arrival there I shall be its unquestioned ruler." Blake started to voice the many questions that were surging through his mind, but an imperious gesture of an outflung tentacle stopped him.