Episode 1
The Twenty-Five Hour Clock
1h
Report on research into biological body clocks, which can effect emotional and physical health and well-being.
Where to watch Horizon
TV series
Horizon
1964TV-PG62 seasons7.4 / 10
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Availability
Not streaming in United States
Checked Jul 22, 2026
Horizon premiered February 4, 1964. We don't have a confirmed streaming, rental or purchase option yet.
Synopsis
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Season 24 episodes
Choose an episode, then use the watch options above for the show.
Episode 2
The Search for the Disappeared
1h
Report on how forensic scientists ae identifying individual victims amongst the people murdered by Argentina's military juntas, by examination and genetic testing of their remains.
Where to watch HorizonEpisode 3
The Blind Watchmaker
1h
In this interview by Horizon, zoologist Richard Dawkins investigates an attack on evolution by scientific creationists, based on the book of the same name by the famous zoologist.
Where to watch HorizonEpisode 4
Riding the Stack
1h
Astronauts and space shuttle designers talk about the risks of space flight, in the light of the space shuttle disaster of January 1986.
Where to watch HorizonEpisode 5
Bruno Bettelheim: The Man Who Cared for Children
1h
Two part documentary on psychologist Bruno Bettelheim and his work with emotionally disturbed children.
Where to watch HorizonEpisode 6
Bruno Bettelheim: A Sense of Surviving
1h
Two part documentary on psychologist Bruno Bettelheim and his work with emotionally disturbed children.
Where to watch HorizonEpisode 7
Energy from Outer Space
1h
Report on exploration into releasing energy sources which came from outer space during the formation of the earth, 4,500 million years ago, and have lain dormant under the earth's crust. In Sweden a five mile deep drill hole was made to unleash this energy.
Where to watch HorizonEpisode 8
The Return of the Osprey
1h
Documentary on the Osprey in north east America, where its natural habitat was being damaged by the use of DDT, but after some conservation work the Osprey is returning to the area.
Where to watch HorizonEpisode 9
Can AIDS Be Stopped?
1h
Report on the development of the AIDS virus, and current research into vaccines to combat the disease.
Where to watch HorizonEpisode 10
Police Stress: The John Wayne Syndrome
1h
Documentary on the increasing pressure put on the British police resulting in stress and psychological disorders, and also on the work of Dr. Douglas Duckworth, a psychologist at Leeds University who has worked with the police on these problems.
Where to watch HorizonEpisode 11
To Engineer Is Human
1h
Engineer Henry Petroski explains why engineering can never be an exact science and looks at examples of engineering failures.
Where to watch HorizonEpisode 12
The Magma Chamber
1h
Report on the research into volcanoes by British scientists Professor Geoff Brow n and Dr. Hazel Rymer, who have developed a technique of exploring the magma chambers of volcanoes and predicting when they will erupt.
Where to watch HorizonEpisode 13
Broken Images
1h
Report on two sufferers of visual agnosia. The condition affects their ability to impose order on the visual world, even though they are not blind, but it does reveal a great deal about normal perception.
Where to watch HorizonEpisode 14
Trial Babies
1h
Report on the different tests done on pregnant women to detect abnormalities in the foetus, with investigation of why these tests are not available in all pregnancies.
Where to watch HorizonEpisode 15
After Chernobyl - Closer to Home
1h
Report on the safety of UK nuclear power stations, following the accident at Chernobyl in the USSR in 1986. The programme focuses on the nuclear installation at Hartlepool on Teeside, which has the smallest evacuation zone in the western world.
Where to watch HorizonEpisode 16
Making Sex Pay
1h
James Gould, Professor of Biology at Princeton University, lectures on the mating habits of animals and humans.
Where to watch HorizonEpisode 17
The Anthropic Principle
1h
Discussion of the Anthropic Principle, a scientific theory for man's place in th e Universe.
Where to watch HorizonEpisode 19
Aircrash: The Burning Issue
1h
Report on the need for improved safety features on airplanes in particular the desirability of smoke hoods, plus an interview with a survivor of the 1985 Manchester aircrash.
Where to watch HorizonEpisode 20
The Riddle of the Joints
1h
Report on research into rheumatoid arthritis.
Where to watch HorizonEpisode 21
To Catch a Falling Star
1h
Report on the future and commercial benefit of research into astronomy conducted by the Royal Greenwich Observatory and other scientific institutions in Great Britain.
Where to watch HorizonEpisode 22
In the Light of New Information
1h
Report on the evolution of laser light technology for communication in the 21st century, with a dramatised account of the effect of the technology on our daily lives.
Where to watch HorizonEpisode 23
Janice's Choice
1hfinale
Janice Blenkharn's mother died of Huntington's Chorea, which any child of a victim has a 50-50 chance of inheriting. Janice is faced with the choice of having a test, developed after research in South America, to see if she has this incurable genetic disease.
Where to watch HorizonEpisode information updated Jul 25, 2026
Available now in United States
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Cast
Richard Branson
Nicholas SoamesBob Brier
Robert Winston
Robert GalloTrevor R. Bryce
Joshua Wurman
Bill PatersonProduction details
- Status
- Returning Series
- Series type
- Documentary
- Episodes
- 1,173
- Original language
- English
Networks & production
BBC TwoUnited Kingdom
Themes
philosophyscience