When The Robot announces that he has detected Alpha Centauri, the Robinsons are overjoyed! They have finally reached their real destination, and they prepare to land. But when they arrive, they discover a planet run by teenagers, who quickly sequester Will and Penny. Attempts to indoctrinate Will and Penny partially succeed, but they break away only to see their parents depart, claiming to have only one daughter, Judy! Who really runs this planet, and why do they need Will and Penny so badly?