In order to test human stamina at high altitudes, Barton and two other men go up in a balloon. When one panics and fails the required standards he is replaced by a woman which draws a hostile response from the remaining pilot.

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.

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.

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.

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.

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.

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

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.

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

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

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.

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

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

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

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.

Barton tests candidates for command positions in space.

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

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

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

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

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

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

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

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

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

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

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