An alien giantess named Qada comes to Earth, wishing to initiate peaceful contact with humanity. The United States government, opting against killing the alien, opts to begin a dialogue with her, appointing a young official from the State Department named Jessica Leeds to the task. The two women form a bond, even as the senior military official in charge, an aggressive warmonger named Tobias Carter, starts attempting to figure out a method of killing Qada, considering her a threat. Qada eventually shrinks down to a more normal size, and Carter takes the opportunity to take Qada into custody and begin aggressively interrogating her. Carter’s troops, however, take issue with this, and help Jessica and her husband to free Qada. Carter, however, shoots and injures Jessica. Qada promptly feeds Jessica some of her breast milk and, with a beam of energy from her ship, heals her, simultaneously causing both of them to grow into giantesses. Qada opts to leave, and Jessica remains on earth, slowly shrinking back to normal size.