Episode 1
Tibet - The Ice Mother
1h
Horizon presents a documentary on the ideas of Maureen Raymo's thesis on what triggered the last ice age.
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 32 episodes
Choose an episode, then use the watch options above for the show.
Episode 2
Russia's Deep Secrets
1h
Horizon follows an expedition from Russia's most advanced oceanographic exploration ship on a mission to clean-up and prevent radioactive contamination of the ocean by one of Russia's sunken nuclear submarines.
Where to watch HorizonEpisode 3
Bones of Contention
1h
This episode of Horizon explores collections of the bones of thousands of Native American Indians in museums and universities across the United States.
Episode credits
Guest stars Maria Pearson, David Van Horn, Larry Zimmerman, Suzan Harjo, Richard Jantz
Episode 4
Siamese Twins
1h
Horizon presents the story of a pair of Siamese twins and the surgery they underwent to try and separate them.
Where to watch HorizonEpisode 5
Too Big Too Soon?
1h
Horizon investigates whether the human growth hormone is really the new wonder drug of the 21st century.
Where to watch HorizonEpisode 6
Farewell Fantastic Venus
1h
Horizon brings you the recent discovery of the real Venus as space probes, like the Magellan, shattered previous existing concerning its geology.
Where to watch HorizonEpisode 7
Exodus
1h
Horizon follows the a six month study of the world's first Environmental Impact Assessment team as they study the implications for the environment for major environmental events such as in Tanzania, when in April last year, nearly half a million people set up home in the refugee camp of Benaco.
Where to watch HorizonEpisode 8
The Betrayers
1h
Horizon has uncovered disturbing evidence of the fabrication of scientific research results.
Where to watch HorizonEpisode 10
The I-Bomb
1h
Horizon presents this documentary on how national power is moving into the hands of those who control information.
Episode credits
Written by Kate O'SullivanGuest stars Zam Baring
Episode 11
Foetal Attraction
1h
This episode of Horizon reveals the results of research that could explain the major reasons for so many complications during pregnancy.
Where to watch HorizonEpisode 12
Cracks in the Crust
1h
Horizon tries to answer the question, "Has the dream of earthquake prediction finally been shattered?"
Where to watch HorizonEpisode 13
Hearing Voices
1h
Horizon explores the phenomenon often regarded as the first sign of madness - hearing voices. The report describes how the work of a leading Dutch professor of psychiatry, Marius Romme, has influenced psychologists and psychiatrists in Britain to rethink their current definitions of madness.
Where to watch HorizonEpisode 14
Liar
1h
Horizon presents a documentary that reveals the role played by deception in society and the effort by science to weed out the truth and the controversy over the accuracy of the polygraph test.
Where to watch HorizonEpisode 15
The Human Laboratory
1h
Horizon investigates the controversial research into some birth control contraceptives.
Where to watch HorizonEpisode 16
Nanotopia
1h
This episode of Horizon is about the future of micro-technology. In 1959, noted American physicist Richard Feynman offered a $1000 prize to anyone who could build an electronic motor no larger than half a millimetre on any side. He awarded the prize within eight months. Today, some scientists predict the imminent development of molecular computers the size of specks of dust. This program examines that and other technical possibilities, as it takes viewers on a guided tour of the cutting-edge laboratories of nanotechnology. There, scientists working on similarly astounding projects offer their predictions about future technological developments. Discussions include how nature provides scientific inspiration. Detailed scientific models and sophisticated computer graphics illustrate how these new micro-technologies will work.
Where to watch HorizonEpisode 17
Hunt for the Doomsday Asteroid (Update)
1h
Horizon presents an update on the story about asteroids colliding with Earth some day.
Where to watch HorizonEpisode 18
A Code In The Nose
1h
Horizon looks at an attempt to crack the mystery of smell by designing a molecule whose odour can be detected.
Where to watch HorizonEpisode 19
AIDS: Behind Closed Doors
1h
This report by Horizon brings you the latest research into the battle agains the AIDS virus.
Where to watch HorizonEpisode 20
The Runaway Mountain
1hfinale
Horizon presents the story of the search for an explanation of how rock can flow like water.
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