Dr. Daniel Scott, through experimentation with lab animals, has invented a serum that enables an organism to adapt itself to overcome injuries and disease. He gets his chance to try his experimental drug on a dying tubercular patient named Kyra Zelas.Scott and his colleague, Dr. Herman Bach, are amazed when the girl recovers, but she soon begins to exhibit strange actions. Her physical appearance can change to hide her abhorrent behavior. She appears to adapt herself emotionally to save herself. But can she love?Kyra Zelas has become the Adaptive Ultimate. How she adapts to survive may be to the detriment of the human race.The Adaptive Ultimate originally appeared in the November 1935 issue of Astounding Stories under the pseudonym John Jessel.More
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