Its animal eyes stared at the three humans. And it felt a hatred for the men who did not understand it. And it felt a desire for the woman who feared it. A desire that crept out of the primeval jungles. That swept through it to find one of its kind. And there was the vague instinct that was Gaddon, who told it how to fulfill that desire. Gaddon, who knew where the secret lay. And then there was the driving urge that swept up from the animal ages. The urge to kill, to destroy what was hated. And the eyes of the monster fastened on the figure of Fenwick as the doctor turned from the table, the hypodermic in his hand. "All right, Gaddon ..." The voice of Fenwick trailed off. And Fred Trent stared at the face of the monster. What he saw there brought a chill to his being. And he heard the girl gasp from the far corner of the room, as her eyes too saw the change that had spread over the face of the creature. For there was no longer any vestige of human recognition in that face. There was no longer any trace of the man who had been Gaddon. There was only the monster now. The twisted, leering lips of an animal mind. A harsh growl left those lips then and the creature moved forward toward the surgeon. Trent knew what was happening, and he knew what he must do. There was death on that bestial face. Death that was reaching out ... He heard the dim baying of the Great Dane from the rear of the house as he leaped forward. Then his fist lashed out and caught the animal face in a lashing blow. His knuckles felt numb as he screamed: "The hypodermic--doctor--quick!" Then the creature turned on him and a long arm shot out. Trent felt a claw rake across his face and felt the burning bite of that claw sink into his flesh. Then, as he tried to dodge away from the beast and bring his fist up again, the monster leaped at him and Trent felt a powerful blow crash against his chin. He spun back, falling to the floor, his head hitting the edge of an examining table. His senses reeled and he felt the blood running down his cheek, a warm, sticky stream that dripped to the floor. He fought to keep his consciousness as he saw the beast turn away from him, satisfied that he was out of the way. Then he saw it leap at the stunned figure of Fenwick. He heard the girl scream in terror and he saw Fenwick's arm come up with the hypodermic. He saw the doctor try to bring the needle down in a jab, but the monster's arm swept the needle aside and then a claw-like hand gripped Fenwick's throat. There was a gasp of terror from Fenwick's lips as those fingers closed around his neck. Then the hypodermic fell from his nerveless hand and he fought to break away. A deep rumbling growl spat from the lips of the monster as it closed with the struggling figure of Fenwick. Then the claws that were its hands raked the surgeon's throat in a feline rage.