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.