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- Season 0 1966-12-25
- Season 1 1964-02-04
- 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 2010-09-27
- Season 49 2011-08-08
- Season 50 2012-07-23
- Season 51 2013-08-12
- Season 52 2014-08-18
- 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 7 Biology at War: A Plague in the Wind
7.40 60 minutes This is the second part, of a two-part special series. In this episode, Horizon looks at the history of germ warfare and the research still continuing today in military labs under deceptive name of defensive biology.
