1. What has been left behind on the third planet?

2. How is the ruum set?

3. What happens to the cruiser?

4. What is Jim setting out to do?

5. How many of Jim's twenty-one days remain as he sets out for the new region?

6. What makes Jim stiffen to a halt and drop his jaw?

7. What causes Jim to break out in perspiration?

8. What sizes are the animals?

9. What does Jim think the spheroid means to do?

10. How much does Jim weigh?

11. What does Jim remember when he sees a huge boulder hanging over the trail?

12. How does Jim spend his 20-minute respite?

13. How does the ruum attempt to get up the cliff?

14. Why does Jim change his course and cut back toward his camp?

15. What happens to the bear?

16. What happens when the dynamite explodes?

17. What does the ruum do when it reaches Jim?

18. What does Walt say the night's run cost Jim?