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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 17 The Ghost Of The Amoco Cadiz
- Season 17 You Are Old, Father William
- Season 17 Cleared for Take-Off
- Season 17 A Sporting Chance
- Season 17 The Cancer Detectives of Lin Xian
- Season 17 The Big If...
- Season 17 Cash from Trash
- Season 17 Encounter with Jupiter
- Season 17 Portrait of a Poison
- Season 17 Magnet Earth
- Season 17 Goodbye Gutenberg
- Season 17 Invasion of the Virions
- Season 17 Beyond the Milky Way
- Season 17 Little Boxes
- Season 17 The Other Kenya
- Season 17 Moving Still
- Season 17 The Way Out
- Season 17 The Dead Sea Lives
- Season 17 Once in a Million Years
- Season 17 Smoker's Luck
- Season 17 Behind the Horoscope
- Season 17 The Mondragon Experiment
- Season 17 The Spike
- Season 17 The Slatemakers
- Season 17 Anatomy of a Volcano
Horizon - Season 17 Episode 6 The Big If...
7.40 60 minutes About Interferon, a drug made from human blood cells, thought to be capable of controlling viruses and cancer
