Four years later, the children of Earth begin to demonstrate advanced psychic abilities and form a mental link with Jennifer. The Greggson family is wary of what is happening to her and they move to the free city of New Athens, hoping to escape Karellen's influence. Ricky finally succumbs to his illness. Karellen announces to the world that all of the children will be gathered together, that no more children will be born, and that the adults are free to live out their lives as they wish. The children begin to float off through the sky. The mayor of New Athens decides that hope is lost and sets off a nuclear bomb, destroying the city. Milo smuggles himself aboard one of the ships transporting zoo animals, and upon arrival at the Overlords' home world he is shown a glimpse of the Overmind, a vast cosmic intelligence which they serve. Milo returns to Earth some 80 years later (due to time dilation), just before the moment when the children join the Overmind. He goes to the surface and begins transmitting a report to Karellen (the first part of which was shown in Episode 1). He asks Karellen to leave behind some memento of Earth's culture, and Karellen obliges. The Earth is destroyed as the children join the Overmind.