Highlights
Horizon

Horizon - 2025 (2025)

Audience Score
74

Where to Watch 'Horizon' 2025

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2025 Episodes

1. Confessions of a Brain Surgeon

August 18th, 202558 min

Top brain surgeon Henry Marsh is facing his own life-threatening diagnosis. He reveals the huge risks and emotional impact of a job filled with difficult life-and-death decisions. This heartwarming portrait of an eccentric surgical hero facing the end of his life reveals the truth about brain surgery and its human impact, with devastating emotional power and life-affirming honesty.

2. Disease X: Hunting the Next Pandemic

September 22nd, 202558 min

Virologist Dr Chris van Tulleken embarks on a global investigation into the hunt for the pathogen that could trigger the next pandemic and the cutting-edge science developed to tackle it. Known only as "Disease X", it is shrouded in uncertainty. Its origin is unknown, how it could spread is unclear, but its impact could be much more severe than Covid-19. To uncover what Disease X might be, where it could emerge and what traits it needs to spread, Chris follows the paths of past deadly viruses. He visits the ground zero of the Nipah virus in Malaysia, which inspired the film Contagion. He also heads to the front line of the ongoing bird flu outbreak in American dairy cattle in California.

3. Secrets of The Brain (1)

September 29th, 202558 min

Theoretical physicist Professor Jim Al-Khalili goes on a journey through 600 million years of evolution to uncover how the human brain, the most complex structure known in the universe, came to exist. With some 100 billion neurons and over 100 trillion connections - more than all the stars in the Milky Way - the human brain is one of nature's greatest achievements. But how did something so incredibly sophisticated evolve from its simple beginnings?

4. Secrets of the Brain (2)

October 6th, 202558 min

Jim watches primates in action to see how they tackle survival challenges, revealing the clever tricks that shaped the brain's thinking. But the real breakthrough came when brains learned to be social. Teaming up with his wife, Jim investigates how relationships and friendships made people more intelligent. With AI getting smarter by the day, Jim wants to know what makes biological brains so special. Through scans, fossil discoveries and cutting-edge research, he uncovers what makes the brain so hard to emulate.

All Seasons

2025
Aug 18, 2025
2024
Jul 22, 2024
90
2022
Mar 31, 2022
2021
Jan 4, 2021
2020
Jan 16, 2020
83
2019
Jan 23, 2019
75
2018
Feb 5, 2018
74
2017
Jan 19, 2017
81
2016
Mar 16, 2016
75
2014-2015
Aug 18, 2014
73
2013-2014
Aug 12, 2013
77
2012-2013
Jul 23, 2012
78
2011-2012
Aug 8, 2011
100
2010-2011
Sep 27, 2010
80
2009-2010
Oct 13, 2009
78
2009
Jan 26, 2009
20
2008
Jan 15, 2008
90
2007
Mar 13, 2007
2006
Jan 12, 2006
50
2005
Jan 13, 2005
90
2004
Jan 8, 2004
2003
Jan 9, 2003
2002
Jan 10, 2002
50
2001
Jan 25, 2001
2000
Jan 12, 2000
80
1999
Jan 28, 1999
80
1998
Feb 19, 1998
1997
Feb 27, 1997
1996
Jan 8, 1996
70
1995
Jan 9, 1995
1994
Jan 10, 1994
30
1993
Jan 4, 1993
1992
Jan 6, 1992
1991
Jan 7, 1991
1990
Jan 8, 1990
1989
Jan 9, 1989
1988
Jan 4, 1988
1987
Jan 5, 1987
1986
Jan 6, 1986
1985
Jan 7, 1985
1984
Jan 9, 1984
70
1983
Jan 10, 1983
10
1982
Jan 11, 1982
80
1981
Jan 5, 1981
1980
Jan 14, 1980
1979
Feb 26, 1979
1978
Jan 6, 1978
1977
Jan 7, 1977
1976
Jan 5, 1976
1975
Jan 20, 1975
1974
Jan 7, 1974
80
1973
Jan 4, 1973
1972
Jan 3, 1972
1971
Jan 4, 1971
80
1970
Jan 5, 1970
1969
Jan 2, 1969
1968
Jan 2, 1968
1967
Jan 17, 1967
1966
Jan 2, 1966
1965
Jan 6, 1965
1964
Feb 4, 1964
Specials
Dec 25, 1966