Season
- Season 61 2025-08-18
- Season 60 2024-07-22
- Season 59 2022-03-31
- Season 58 2021-01-04
- Season 57 2020-01-16
- Season 56 2019-01-23
- Season 55 2018-02-05
- Season 54 2017-01-19
- Season 53 2016-03-16
- Season 52 2014-08-18
- Season 51 2013-08-12
- Season 50 2012-07-23
- Season 49 2011-08-08
- Season 48 2010-09-27
- Season 47 2009-10-13
- Season 46 2009-01-26
- Season 45 2008-01-15
- Season 44 2007-03-13
- Season 43 2006-01-12
- Season 42 2005-01-13
- Season 41 2004-01-08
- Season 40 2003-01-09
- Season 39 2002-01-10
- Season 38 2001-01-25
- Season 37 2000-01-12
- Season 36 1999-01-28
- Season 35 1998-02-19
- Season 34 1997-02-27
- Season 33 1996-01-08
- Season 32 1995-01-09
- Season 31 1994-01-10
- Season 30 1993-01-04
- Season 29 1992-01-06
- Season 28 1991-01-07
- Season 27 1990-01-08
- Season 26 1989-01-09
- Season 25 1988-01-04
- Season 24 1987-01-05
- Season 23 1986-01-06
- Season 22 1985-01-07
- Season 21 1984-01-09
- Season 20 1983-01-10
- Season 19 1982-01-11
- Season 18 1981-01-05
- Season 17 1980-01-14
- Season 16 1979-02-26
- Season 15 1978-01-06
- Season 14 1977-01-07
- Season 13 1976-01-05
- Season 12 1975-01-20
- Season 11 1974-01-07
- Season 10 1973-01-04
- Season 9 1972-01-03
- Season 8 1971-01-04
- Season 7 1970-01-05
- Season 6 1969-01-02
- Season 5 1968-01-02
- Season 4 1967-01-17
- Season 3 1966-01-02
- Season 2 1965-01-06
- Season 1 1964-02-04
- Season 0 1966-12-25
Episode
- Episode 1: Horizon Christmas Special: Hand me my Sword, Humphrey
- Episode 2: The Case of the Ancient Astronauts
- Episode 3: The Mind's Eye
- Episode 4: 25 Years in Space
- Episode 5: Biology at War: The Mystery of Yellow Rain
- Episode 6: Beyond the Moon
- Episode 7: Biology at War: A Plague in the Wind
- Episode 8: Twenty-First Birthday
- Episode 9: Halley's Comet - The Apparition
- Episode 10: Halley's Comet - The Encounter
- Episode 11: The Diary of Discovery
- Episode 12: Making an Honest Fiver
- Episode 13: Red Star in Orbit: The Invisible Spaceman
- Episode 14: Red Star in Orbit: The Dark Side of the Moon
- Episode 15: Red Star in Orbit: The Mission
- Episode 16: A Close Encouter of the Second Kind
- Episode 17: Hide and Seek in Iraq
- Episode 18: The Truth About Sex
- Episode 19: Assault on the Male
- Episode 20: 30th Anniversary - The Far Side
- Episode 21: Twice Born
- Episode 22: Einstein: The Miracle Year
- Episode 23: Einstein: Fame
- Episode 24: BSE: The Invisible Enemy
- Episode 25: BSE: The Human Experiment
- Episode 26: Molecules With Sunglasses (Update)
- Episode 27: Ice Mummies: The Ice Maiden
- Episode 28: Ice Mummies: A Life in Ice
- Episode 29: Ice Mummies: Frozen in Heaven
- Episode 30: Computers Don't Bite, Inside the Internet
- Episode 31: Antarctica: The Ice Lives
- Episode 32: Antarctica: The Ice Forms
- Episode 33: Antarctica: The Ice Melts
- Episode 34: Crash
- Episode 35: Darwin: The Legacy
- Episode 36: Longitude
- Episode 37: Fat Files: Born to Be Fat
- Episode 38: Fat Files: Fixing Fat
- Episode 39: Fat Files: Living on Air
- Episode 40: Atlantis Uncovered
- Episode 41: Atlantis Reborn
- Episode 42: Life and Death in the 21st Century: Living Forever
- Episode 43: Life and Death in the 21st Century: Future Plagues
- Episode 44: Life and Death in the 21st Century: Designer Babies
- Episode 45: Inside the Internet
- Episode 46: Life on Mars
- Episode 47: Destination Mars
- Episode 48: What Sank the Kursk?
- Episode 49: First Olympians: A Horizon Special
- Episode 50: Everest: Doctors in the Death Zone (1)
- Episode 51: Everest: Doctors in the Death Zone (2)
- Episode 52: Lost Horizons: The Big Bang
- Episode 53: How Mad Are You? (1)
- Episode 54: How Mad Are You? (2)
- Episode 55: 40 Years on the Moon
- Episode 56: Pandemic: A Horizon Guide
- Episode 57: Mars: A Horizon Guide
- Episode 58: How Many People Can Live on Planet Earth?
- Episode 59: Diet: A Horizon Guide
- Episode 60: The End of God? A Horizon Guide to Science and Religion
- Episode 61: What Makes Us Clever? A Horizon Guide to Intelligence
- Episode 62: Japan Earthquake: A Horizon Special
- Episode 63: The Space Shuttle: A Horizon Guide
- Episode 64: The End of the World? A Horizon Guide to Armageddon
- Episode 65: Carrot or Stick? A Horizon Guide to Raising Kids
- Episode 66: Extinct: A Horizon Guide to Dinosaurs
- Episode 67: The Hunt for Higgs: A Horizon Special
- Episode 68: Woof! A Horizon Guide to Dogs
- Episode 69: The Hunt for AI
- Episode 70: Stuff: A Horizon Guide to Materials
- Episode 71: Blink: A Horizon Guide to the Senses
- Episode 72: Immortal? A Horizon Guide to Ageing
- Episode 73: Mission to Mars: A Horizon Special
- Episode 74: The Final Frontier: A Horizon Guide to the Universe
- Episode 75: The Truth About Meteors: A Horizon Special
- Episode 76: Mend Me: A Horizon Guide to Transplants
- Episode 77: Tomorrow's World: A Horizon Special
- Episode 78: What's Killing Our Bees? A Horizon Special
- Episode 79: Comet of the Century: A Horizon Special
- Episode 80: The £10 Million Challenge
- Episode 81: The Transit of Venus: A Horizon Special
- Episode 100: The Great British Drought
- Episode 101: Festival 77: Horizon 2002
- Episode 102: Darwin's Dream
- Episode 103: A Killer in the Village - Update
- Episode 104: Life Story
- Episode 105: Sex: A Horizon Guide
- Episode 106: Climate Change: A Horizon Guide
- Episode 107: The Mystery of Murder: A Horizon Guide
- Episode 108: The Horizon Guide to AI
- Episode 109: Tim Peake Special - How to be an Astronaut
- Episode 110: Jimmy Carr and the Science of Laughter
- Episode 111: Horizon Special: The Vaccine
- Episode 112: The Life and Times of El Niño
- Episode 113: Impact! A Horizon Guide to Plane Crashes
- Episode 114: Impact! A Horizon Guide to Car Crashes
- Episode 115: Cat Watch 2014 - A Cat's Eye View
- Episode 116: Cat Watch 2014 - The Lion in Your Lap
- Episode 117: Cat Watch 2014 - Cat Talk
- Episode 118: What's The Right Diet For You? Part 1
- Episode 119: What's The Right Diet For You? Part 2
- Episode 120: What's The Right Diet For You? Part 3
- Episode 121: Journey to the Moon: A Horizon Special
- Episode 122: Alastair Campbell: Depression and Me
- Episode 123: Ice Station Antarctica: Part One
- Episode 124: Ice Station Antarctica: Part Two
- Episode 125: Coronavirus Special - Part 1
- Episode 126: Coronavirus Special - Part 2
- Episode 127: Coronavirus Special - What We Know Now
- Episode 128: Horizon Special: The Vaccine
- Episode 999: Delete
Horizon Specials Red Star in Orbit: The Invisible Spaceman
Horizon tells amazing science stories, unravels mysteries and reveals worlds you've never seen before.
