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Horizon

Horizon (1964-2025) - 2025 Episodes and Ratings

Audience Score
74

Watch 'Horizon' 2025 Online

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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

2025

Aug 18, 2025
2024

2024

Jul 22, 2024
90
2022

2022

Mar 31, 2022
2021

2021

Jan 4, 2021
2020

2020

Jan 16, 2020
80
2019

2019

Jan 23, 2019
75
2018

2018

Feb 5, 2018
74
2017

2017

Jan 19, 2017
81
2016

2016

Mar 16, 2016
75
2014-2015

2014-2015

Aug 18, 2014
73
2013-2014

2013-2014

Aug 12, 2013
77
2012-2013

2012-2013

Jul 23, 2012
80
2011-2012

2011-2012

Aug 8, 2011
100
2010-2011

2010-2011

Sep 27, 2010
80
2009-2010

2009-2010

Oct 13, 2009
88
2009

2009

Jan 26, 2009
20
2008

2008

Jan 15, 2008
90
2007

2007

Mar 13, 2007
2006

2006

Jan 12, 2006
2005

2005

Jan 13, 2005
90
2004

2004

Jan 8, 2004
2003

2003

Jan 9, 2003
2002

2002

Jan 10, 2002
2001

2001

Jan 25, 2001
2000

2000

Jan 12, 2000
80
1999

1999

Jan 28, 1999
80
1998

1998

Feb 19, 1998
1997

1997

Feb 27, 1997
1996

1996

Jan 8, 1996
70
1995

1995

Jan 9, 1995
1994

1994

Jan 10, 1994
30
1993

1993

Jan 4, 1993
1992

1992

Jan 6, 1992
1991

1991

Jan 7, 1991
1990

1990

Jan 8, 1990
1989

1989

Jan 9, 1989
1988

1988

Jan 4, 1988
1987

1987

Jan 5, 1987
1986

1986

Jan 6, 1986
1985

1985

Jan 7, 1985
1984

1984

Jan 9, 1984
70
1983

1983

Jan 10, 1983
10
1982

1982

Jan 11, 1982
80
1981

1981

Jan 5, 1981
1980

1980

Jan 14, 1980
1979

1979

Feb 26, 1979
1978

1978

Jan 6, 1978
1977

1977

Jan 7, 1977
1976

1976

Jan 5, 1976
1975

1975

Jan 20, 1975
1974

1974

Jan 7, 1974
80
1973

1973

Jan 4, 1973
1972

1972

Jan 3, 1972
1971

1971

Jan 4, 1971
80
1970

1970

Jan 5, 1970
1969

1969

Jan 2, 1969
1968

1968

Jan 2, 1968
1967

1967

Jan 17, 1967
1966

1966

Jan 2, 1966
1965

1965

Jan 6, 1965
1964

1964

Feb 4, 1964
Specials

Specials

Dec 25, 1966