Wonder Woman #163

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When Dr. Psycho notices Diana Prince and Steve Trevor near the cage of Giganta, a female gorilla, he decides to hurt Wonder Woman by hypnotizing Giganta into falling in love with Steve Trevor. The gorilla grabs Steve and, when Diana changes into Wonder Woman, overpowers the heroine, but falls victim to the Magic Lasso. Professor Zool appears on the scene, asking that the gorilla be turned over to him for evolutionary experimentation, and Psycho decides to capitalize on it.