- 1 Wildlife - The Last Great Battle
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In this episode, Horizon looks a the efforts of zoos to save animal species from extinction by breeding enough to ensure their survival in captivity
Air Date: 1971-01-04
- 2 Great Ormond Street
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In this episode, Horizon looks at the renowned British hospital for children, Great Ormond Street, and the Institute of Child Health.
Air Date: 1971-01-18
- 3 A Bulldozer Through Heaven
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Horizon explores the island of New Guinea and its cultural changes going on there.
Air Date: 1971-01-25
- 4 Rumors of War
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This episode of Horizon looks at the growing arsenal of nuclear weapons over the last 25 years and the effects it has on the arms race.
Air Date: 1971-02-01
- 5 I'm Dependent - You're Addicted
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This episode investigates the facts about drug abuse and experimental work undertaken in this area.
Air Date: 1971-02-15
- 6 Kuru - To Tremble With Fear
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Kuru is a unique disease of the people of New Guinea. Horizon goes with Prof. E. J. Field to find out why.
Air Date: 1971-02-22
- 7 Due to a Lack of Interest, Tomorrow Has Been Canceled
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Horizon interviews ecologists that claim that man is irrevocably destroying its habitat.
Air Date: 1971-03-08
- 8 What Kind of Doctor?
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Horizon investigates medical student training at the St. Thomas hospital in London, England.
Air Date: 1971-03-15
- 9 Nice Sort of Accident to Have
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Horizon explores the causes, and looks for way to prevent car accidents
Air Date: 1971-03-22
- 10 The Wood
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This report by Horizon looks at the long term ecological study of the forest at Wytham Wood, Oxon, in England.
Air Date: 1971-04-05
- 11 The Measure of a Man
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In 1971, Horizon reviews the life and work of Prof. Hans Eysnck, the most controversial psychologists of the time.
Air Date: 1971-04-12
- 12 Three Score Years and Then?
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This report by Horizon explores care for the aged, for both medical and welfare services in Britain.
Air Date: 1971-04-26
- 13 Darwin's Bulldog
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Horizon reports on the famous protagonist of "The Origin of Species," Thomas Henry Huxley.
Air Date: 1971-05-03
- 14 The Secret
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This episode of Horizon examines how cells organize to become complex organs, and bodies.
Air Date: 1971-05-10
- 15 What Every Girl Should Know
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No description available
Air Date: 1971-05-17
- 16 Tastes of Food to Come
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Horizon reports on food technology now experimenting with meat substitutes.
Air Date: 1971-05-24
- 17 Looking for a Happy Landing
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No description available
Air Date: 1971-05-31
- 18 A Case of Depression
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Horizon investigates how to treat depressive illneses.
Air Date: 1971-06-07
- 19 The Total War Machine
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This episode of Horizon reports on the development of the aircraft bomber throughout periods of war.
Air Date: 1971-06-14
- 20 The Dinosaur Hunters
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Horizon explores the field of palaeontology, the study of dinosaurs.
Air Date: 1971-06-21
- 21 Your Country Needs You
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This episode of Horizon looks at Britain's civil defense program, and to see if it is adequate in the event of a nuclear war.
Air Date: 1971-09-27
- 22 Rheumatism
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Horizon investigates rheumatism, and looks at why this disease is under-researched.
Air Date: 1971-10-04
- 23 If at First You Don't Succeed...You Don't Succeed
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Can new born babies solve complex problems? Horizon works with psychologists to see how they measure this capacity.
Air Date: 1971-10-11
- 24 One Liverpool or Two?
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Do city planners in Liverpool have unrealistic expectations? Horizon looks into the development and planning process of Liverpool, England.
Air Date: 1971-10-18
- 25 Rutherford, Cavendish
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This is a two part episode of Horizon. First, Horizon looks at the life of centenary Ernest Rutherford, followed by a report of the Cavendish Labratory in Cambridge, England.
Air Date: 1971-10-25
- 26 The Fierce People
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Horizon explores a primitive tribe of Yanomamo Indians living in southern Venezula.
Air Date: 1971-11-01
- 27 The Men Who Painted Caves
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This episode of Horizon looks in the ancient cave paintings found in France.
Air Date: 1971-11-15
- 28 The Crab Nebula
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This episode of Horizon reports on how the Crab Nebula was discovered, and continuing observation of the space encounter.
Air Date: 1971-11-22
- 29 Can Venice Survive?
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Horizon reports on the continuing problem of the city of Venice, Italy sinking into the sea.
Air Date: 1971-11-29
- 30 Willingly to School
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This report by Horizon is about Prof. Hean Piaget and her child center education theory.
Air Date: 1971-12-06
- 31 Periscope War
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Horizon presents the history of the submarines, from pre-World War I to today's nuclear powered submarines.
Air Date: 1971-12-20
- 32 Patently Absurd
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This episode of Horizon investigates strange new inventions.
Air Date: 1971-12-27