The Man and the Challenge

2. Maximum Capacity

Barton sends two men into the frozen north to test their endurance in extreme levels of cold and isolation. He wants to determine the best way to train men for high security jobs in the Arctic.

3. Odds Against Survival

4. Sky Diving

To study the effects of gravity on potential astronauts, Barton goes to France to learn free fall parachuting from a brother-and-sister team of skydivers: Suzanne and Georges Bolet.

5. Experiments in Terror

6. Invisible Force

In a hostile country, three Americans are being held captive. Barton is asked by a Washington official to form a clandestine athletic unit to free them.

7. Escape to Nepal

In order to test the U2-21 drug which supposedly increases a man's ability to retain oxygen at great heights, Barton puts a group of mountaineers through a rigorous test in the Rockies before sending them to the Himalayas for a final test.

8. Border to Border

Two antagonistic jet pilots are entered into a Mexican auto race to prove that a team can overcome obstacles better than any single person could.

9. Trial by Fire

Barton enters an active volcano to test a new type of fire suit. He nearly loses his life in the experiment.

10. White Out

Barton researches hypothermia in Antarctica by reducing the body temperature of two doctors. He hopes the experiment will lead to an understanding of how to freeze astronauts to withstand certain aspects of interplanetary flight.

11. The Breaking Point

A volunteer is sealed in a cell for 30 days and is subjected to psychological torment in order to determine his breaking point.

12. Jungle Survival

Glenn Barton is sent on a dual mission: test survival techniques in the Amazon Basin and determine the fate of four lost fliers.

13. I've Killed Seven Men

14. Man Without Fear

Barton uses a chemical names LSD-25 on a firefighter. The chemical removes fear, but raging forest fires prove that fear is a necessary part of courage.

15. The Visitors

16. The Storm

Glenn Barton is asked to clear the reputation of a man who died mysteriously.

17. Killer River

On a cliff above the Colorado River, Barton rescues a parachuted pilot.

18. Rodeo

Barton investigates the effects of a new rocket belt at a rodeo.

19. The Windowless Room

A crack test pilot crashes his aircraft. After the crash he experiences a self-induced paralysis that slowly destroys his career and marriage. Barton restores the pilot's confidence by using hypnotic techniques.

20. Nightmare Crossing

Barton tests candidates for command positions in space.

21. The Lure of Danger

Barton looks individuals that subconsciously want to destroy themselves. He wants to learn why some men desire death.

22. Recovery

23. Buried Alive

Barton experiments with Yoga to show that it can be helpful in adverting tragedy.

24. Recondo

A warden's daughter is held hostage by four escaped convicts.

25. Flying Lab

Barton performs and experiment to show that ignorance and fear cause lack of efficiency.

26. Hurricane Mesa

Barton conducts a test on a pilot to prove that he can be switched successfully to a desk job.

27. Astro Female

Barton puts four women against four men in order to prove that woman can equal and perhaps surpass males as astronauts.

28. The Extra Sense

In order to prove that emotional stress promotes telepathy, Barton parachutes from a high precipice.

29. Man in a Capsule

Barton conducts a survival test on the surface of the ocean.

30. The Dropper

31. High Dive

32. Daredevils

Barton puts the king of syut drivers through an incredibly dangerous test believing that the secret to survival lies in body chemical reactions.

33. Shooter McLaine

Barton almost dies when a scientist ignoring his own physical limits and Barton's warnings misreads important test instruments.

34. Early Warning

35. Breakoff

36. Highway to Danger

Barton researches highway hypnosis by subjecting himself to driving conditions that have killed five truck drivers.