David Marin risks his reputation and government career when he makes a plea for Wade Trask, a brilliant scientist condemned to be executed for sedition. What Marin doesn't yet realize is that time is quickly running out -- for both of them. Trask is experimenting with transplanting the mind and nervous system of one animal into the body of another. Hysterical with worry, he frantically works. When Marin tries to calm him, this almost mad scientist suddenly blasts his gas gun at him! Now, Marin's very identity is encased in Trask's body. Is Marin doomed to this twisted fate? Will they both become enemies of the government?