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- Season 0 1966-12-25
- Season 1 1964-02-03
- Season 2 1965-01-06
- Season 3 1966-01-02
- Season 4 1967-01-17
- Season 5 1968-01-02
- Season 6 1969-01-02
- Season 7 1970-01-05
- Season 8 1971-01-04
- Season 9 1972-01-03
- Season 10 1973-01-04
- Season 11 1974-01-07
- Season 12 1975-01-20
- Season 13 1976-01-05
- Season 14 1977-01-07
- Season 15 1978-01-06
- Season 16 1979-02-26
- Season 17 1980-01-14
- Season 18 1981-01-05
- Season 19 1982-01-11
- Season 20 1983-01-10
- Season 21 1984-01-09
- Season 22 1985-01-07
- Season 23 1986-01-06
- Season 24 1987-01-05
- Season 25 1988-01-04
- Season 26 1989-01-09
- Season 27 1990-01-08
- Season 28 1991-01-07
- Season 29 1992-01-06
- Season 30 1993-01-04
- Season 31 1994-01-10
- Season 32 1995-01-09
- Season 33 1996-01-08
- Season 34 1997-02-27
- Season 35 1998-02-19
- Season 36 1999-01-28
- Season 37 2000-01-12
- Season 38 2001-01-25
- Season 39 2002-01-10
- Season 40 2003-01-09
- Season 41 2004-01-08
- Season 42 2005-01-13
- Season 43 2006-01-12
- Season 44 2007-03-13
- Season 45 2008-01-15
- Season 46 2009-01-26
- Season 47 2009-10-13
- Season 48 2010-09-26
- Season 49 2011-08-08
- Season 50 2012-07-23
- Season 51 2013-08-12
- Season 52 2014-08-17
- Season 53 2016-03-16
- Season 54 2017-01-19
- Season 55 2018-02-05
- Season 56 2019-01-23
- Season 57 2020-01-16
- Season 58 2021-01-04
- Season 59 2022-03-31
- Season 60 2024-07-22
Season 60 Episode
- Season 0 Horizon Christmas Special: Hand me my Sword, Humphrey
- Season 0 The Case of the Ancient Astronauts
- Season 0 The Mind's Eye
- Season 0 25 Years in Space
- Season 0 Biology at War: The Mystery of Yellow Rain
- Season 0 Beyond the Moon
- Season 0 Biology at War: A Plague in the Wind
- Season 0 Twenty-First Birthday
- Season 0 Halley's Comet - The Apparition
- Season 0 Halley's Comet - The Encounter
- Season 0 The Diary of Discovery
- Season 0 Making an Honest Fiver
- Season 0 Red Star in Orbit: The Invisible Spaceman
- Season 0 Red Star in Orbit: The Dark Side of the Moon
- Season 0 Red Star in Orbit: The Mission
- Season 0 A Close Encouter of the Second Kind
- Season 0 Hide and Seek in Iraq
- Season 0 The Truth About Sex
- Season 0 Assault on the Male
- Season 0 30th Anniversary - The Far Side
- Season 0 Twice Born
- Season 0 Einstein: The Miracle Year
- Season 0 Einstein: Fame
- Season 0 BSE: The Invisible Enemy
- Season 0 BSE: The Human Experiment
- Season 0 Molecules With Sunglasses (Update)
- Season 0 Ice Mummies: The Ice Maiden
- Season 0 Ice Mummies: A Life in Ice
- Season 0 Ice Mummies: Frozen in Heaven
- Season 0 Computers Don't Bite, Inside the Internet
- Season 0 Antarctica: The Ice Lives
- Season 0 Antarctica: The Ice Forms
- Season 0 Antarctica: The Ice Melts
- Season 0 Crash
- Season 0 Darwin: The Legacy
- Season 0 Longitude
- Season 0 Fat Files: Born to Be Fat
- Season 0 Fat Files: Fixing Fat
- Season 0 Fat Files: Living on Air
- Season 0 Atlantis Uncovered
- Season 0 Atlantis Reborn
- Season 0 Life and Death in the 21st Century: Living Forever
- Season 0 Life and Death in the 21st Century: Future Plagues
- Season 0 Life and Death in the 21st Century: Designer Babies
- Season 0 Inside the Internet
- Season 0 Life on Mars
- Season 0 Destination Mars
- Season 0 What Sank the Kursk?
- Season 0 First Olympians: A Horizon Special
- Season 0 Everest: Doctors in the Death Zone (1)
- Season 0 Everest: Doctors in the Death Zone (2)
- Season 0 Lost Horizons: The Big Bang
- Season 0 How Mad Are You? (1)
- Season 0 How Mad Are You? (2)
- Season 0 40 Years on the Moon
- Season 0 Pandemic: A Horizon Guide
- Season 0 Mars: A Horizon Guide
- Season 0 How Many People Can Live on Planet Earth?
- Season 0 Diet: A Horizon Guide
- Season 0 The End of God? A Horizon Guide to Science and Religion
- Season 0 What Makes Us Clever? A Horizon Guide to Intelligence
- Season 0 Japan Earthquake: A Horizon Special
- Season 0 The Space Shuttle: A Horizon Guide
- Season 0 The End of the World? A Horizon Guide to Armageddon
- Season 0 Carrot or Stick? A Horizon Guide to Raising Kids
- Season 0 Extinct: A Horizon Guide to Dinosaurs
- Season 0 The Hunt for Higgs: A Horizon Special
- Season 0 Woof! A Horizon Guide to Dogs
- Season 0 The Hunt for AI
- Season 0 Stuff: A Horizon Guide to Materials
- Season 0 Blink: A Horizon Guide to the Senses
- Season 0 Immortal? A Horizon Guide to Ageing
- Season 0 Mission to Mars: A Horizon Special
- Season 0 The Final Frontier: A Horizon Guide to the Universe
- Season 0 The Truth About Meteors: A Horizon Special
- Season 0 Mend Me: A Horizon Guide to Transplants
- Season 0 Tomorrow's World: A Horizon Special
- Season 0 What's Killing Our Bees? A Horizon Special
- Season 0 Comet of the Century: A Horizon Special
- Season 0 The £10 Million Challenge
- Season 0 The Transit of Venus: A Horizon Special
- Season 0 The Great British Drought
- Season 0 Festival 77: Horizon 2002
- Season 0 Darwin's Dream
- Season 0 A Killer in the Village - Update
- Season 0 Life Story
- Season 0 Sex: A Horizon Guide
- Season 0 Climate Change: A Horizon Guide
- Season 0 The Mystery of Murder: A Horizon Guide
- Season 0 The Horizon Guide to AI
- Season 0 Tim Peake Special - How to be an Astronaut
- Season 0 Jimmy Carr and the Science of Laughter
- Season 0 Horizon Special: The Vaccine
- Season 0 The Life and Times of El Niño
- Season 0 Impact! A Horizon Guide to Plane Crashes
- Season 0 Impact! A Horizon Guide to Car Crashes
- Season 0 Cat Watch 2014 - A Cat's Eye View
- Season 0 Cat Watch 2014 - The Lion in Your Lap
- Season 0 Cat Watch 2014 - Cat Talk
- Season 0 What's The Right Diet For You? Part 1
- Season 0 What's The Right Diet For You? Part 2
- Season 0 What's The Right Diet For You? Part 3
- Season 0 Journey to the Moon: A Horizon Special
- Season 0 Alastair Campbell: Depression and Me
- Season 0 Ice Station Antarctica: Part One
- Season 0 Ice Station Antarctica: Part Two
- Season 0 Coronavirus Special - Part 1
- Season 0 Coronavirus Special - Part 2
- Season 0 Coronavirus Special - What We Know Now
- Season 0 Horizon Special: The Vaccine
- Season 0 Delete
Horizon - Season 0 Episode 53 How Mad Are You? (1)
7.40 60 minutes First of a two-part special. Ten volunteers have come together for an extraordinary test. Five are 'normal' and the other five have been officially diagnosed as mentally ill. Horizon asks if you can tell who is who, and considers where the line between sanity and madness lies.
