Rachel, Devon and Garth come to an uninhabited dome where they find Oro (Walter Koenig), an alien from the planet Xar who has been living a Robinson Crusoe style existence on the Ark for several years. Oro,has acquired the services of Ydana as his' girl Friday. Ydana is an inteligent but fickle woman, a wanderer from another dome. She has been helping Oro repair his space ship in the hope that she might find a "paradise" on Xar. By trickery, Oro commnands the services of Devon, Rachel and Garth to aid him in repairing his ship.

Oro returns, offering to repair the Ark's faulty systems and fly them all to settle on Exar, which he claims is much like earth. Devon discovers he's lying, but can only prove it in a debate in which the loser will be killed.