TV series
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Availability
Checked Jul 22, 2026
Horizon premiered February 4, 1964. We don't have a confirmed streaming, rental or purchase option yet.
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
Choose an episode, then use the watch options above for the show.
Episode 1
As more people than ever report struggling with their sleep, Michael Mosley uses the latest science to explore how this impacts our health and what can be done to improve our sleep.
Guest stars Michael Mosley
Episode 2
BBC News special correspondent Fergal Keane has covered conflict and brutality for more than 30 years and is known for reporting with humanity and extraordinary empathy, but in 2020 revealed he had been diagnosed with an acute form of post-traumatic stress disorder. In this Horizon documentary, he reveals the impact of PTSD on his life, exploring how it led him to consider withdrawing from reporting on conflicts, as well as investigating the latest scientific thinking behind its treatment.
Directed by Mike ConnollyGuest stars Fergal Keane
Episode 3
When she's diagnosed with cervical cancer at the age of 36, Hannah Fry explores the problematic issues surrounding how we screen for and treat cancer, asking if we could be overmedicalising it.
Guest stars Hannah Fry
Episode 4
The inside story of the James Webb Space Telescope, following the Nasa team building the £8 billion device and the scientists taking its first image of distant stars and galaxies.
Where to watch HorizonEpisode information updated Jul 24, 2026
Available now in United States
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