The crew learn more about 'the voice' and his people – they are a peaceful, scientific race from the opposite side of the universe. The crew explore the city, and are disturbed by a close encounter with a sabre-toothed tiger. Fortunately, the creature does not attack them, but they now realize that they have travelled back through time instead of forward. They enter a domed building, walk down a long dark tunnel, and emerge in a huge underground city. They are invited into another building to meet 'the voice', but are terrified by what they find inside...