Here are two stories. 1. The Man With Two Minds: .An alien attempts to take over the mind of Earthman Jake Stewart, but is only partially successful, with each struggling for complete control. Jake comes to realize that the winner of the struggle will affect the survival of Earth itself. 2.Mindswitch. An alien kidnaps and swaps minds with Jack Ramsey so it can spy on Earth in the man's body. Jack remains imprisoned in his ship in the alien's body. Jack cannot do anything to harm the alien because to do so woud be harming his own body. By the same token, Jack knows that the alien will not harm him while he is in the alien's body. But he is imprisoned in the aliens space ship high above Earth, and is helpless as the alien roams Earth in Jack's body.