1: Horizon Horizon Christmas Special: Hand me my Sword, Humphrey

2: Horizon The Case of the Ancient Astronauts

3: Horizon The Mind's Eye

4: Horizon 25 Years in Space

5: Horizon Biology at War: The Mystery of Yellow Rain

6: Horizon Beyond the Moon

7: Horizon Biology at War: A Plague in the Wind

8: Horizon Twenty-First Birthday

9: Horizon Halley's Comet - The Apparition

10: Horizon Halley's Comet - The Encounter

11: Horizon The Diary of Discovery

12: Horizon Making an Honest Fiver

13: Horizon Red Star in Orbit: The Invisible Spaceman

14: Horizon Red Star in Orbit: The Dark Side of the Moon

15: Horizon Red Star in Orbit: The Mission

16: Horizon A Close Encouter of the Second Kind

17: Horizon Hide and Seek in Iraq

18: Horizon The Truth About Sex

19: Horizon Assault on the Male

20: Horizon 30th Anniversary - The Far Side

21: Horizon Twice Born

22: Horizon Einstein: The Miracle Year

23: Horizon Einstein: Fame

24: Horizon BSE: The Invisible Enemy

25: Horizon BSE: The Human Experiment

26: Horizon Molecules With Sunglasses (Update)

27: Horizon Ice Mummies: The Ice Maiden

28: Horizon Ice Mummies: A Life in Ice

29: Horizon Ice Mummies: Frozen in Heaven

30: Horizon Computers Don't Bite, Inside the Internet

31: Horizon Antarctica: The Ice Lives

32: Horizon Antarctica: The Ice Forms

33: Horizon Antarctica: The Ice Melts

34: Horizon Crash

35: Horizon Darwin: The Legacy

36: Horizon Longitude

37: Horizon Fat Files: Born to Be Fat

38: Horizon Fat Files: Fixing Fat

39: Horizon Fat Files: Living on Air

40: Horizon Atlantis Uncovered

41: Horizon Atlantis Reborn

42: Horizon Life and Death in the 21st Century: Living Forever

43: Horizon Life and Death in the 21st Century: Future Plagues

44: Horizon Life and Death in the 21st Century: Designer Babies

45: Horizon Inside the Internet

46: Horizon Life on Mars

47: Horizon Destination Mars

48: Horizon What Sank the Kursk?

49: Horizon First Olympians: A Horizon Special

50: Horizon Everest: Doctors in the Death Zone (1)

51: Horizon Everest: Doctors in the Death Zone (2)

52: Horizon Lost Horizons: The Big Bang

53: Horizon How Mad Are You? (1)

54: Horizon How Mad Are You? (2)

55: Horizon 40 Years on the Moon

56: Horizon Pandemic: A Horizon Guide

57: Horizon Mars: A Horizon Guide

58: Horizon How Many People Can Live on Planet Earth?

59: Horizon Diet: A Horizon Guide

60: Horizon The End of God? A Horizon Guide to Science and Religion

61: Horizon What Makes Us Clever? A Horizon Guide to Intelligence

62: Horizon Japan Earthquake: A Horizon Special

63: Horizon The Space Shuttle: A Horizon Guide

64: Horizon The End of the World? A Horizon Guide to Armageddon

65: Horizon Carrot or Stick? A Horizon Guide to Raising Kids

66: Horizon Extinct: A Horizon Guide to Dinosaurs

67: Horizon The Hunt for Higgs: A Horizon Special

68: Horizon Woof! A Horizon Guide to Dogs

69: Horizon The Hunt for AI

70: Horizon Stuff: A Horizon Guide to Materials

71: Horizon Blink: A Horizon Guide to the Senses

72: Horizon Immortal? A Horizon Guide to Ageing

73: Horizon Mission to Mars: A Horizon Special

74: Horizon The Final Frontier: A Horizon Guide to the Universe

75: Horizon The Truth About Meteors: A Horizon Special

76: Horizon Mend Me: A Horizon Guide to Transplants

77: Horizon Tomorrow's World: A Horizon Special

78: Horizon What's Killing Our Bees? A Horizon Special

79: Horizon Comet of the Century: A Horizon Special

80: Horizon The £10 Million Challenge

81: Horizon The Transit of Venus: A Horizon Special

100: Horizon The Great British Drought

101: Horizon Festival 77: Horizon 2002

102: Horizon Darwin's Dream

103: Horizon A Killer in the Village - Update

104: Horizon Life Story

105: Horizon Sex: A Horizon Guide

106: Horizon Climate Change: A Horizon Guide

107: Horizon The Mystery of Murder: A Horizon Guide

108: Horizon The Horizon Guide to AI

109: Horizon Tim Peake Special - How to be an Astronaut

110: Horizon Jimmy Carr and the Science of Laughter

111: Horizon Horizon Special: The Vaccine

112: Horizon The Life and Times of El Niño

113: Horizon Impact! A Horizon Guide to Plane Crashes

114: Horizon Impact! A Horizon Guide to Car Crashes

115: Horizon Cat Watch 2014 - A Cat's Eye View

116: Horizon Cat Watch 2014 - The Lion in Your Lap

117: Horizon Cat Watch 2014 - Cat Talk

118: Horizon What's The Right Diet For You? Part 1

119: Horizon What's The Right Diet For You? Part 2

120: Horizon What's The Right Diet For You? Part 3

121: Horizon Journey to the Moon: A Horizon Special

122: Horizon Alastair Campbell: Depression and Me

123: Horizon Ice Station Antarctica: Part One

124: Horizon Ice Station Antarctica: Part Two

125: Horizon Coronavirus Special - Part 1

126: Horizon Coronavirus Special - Part 2

127: Horizon Coronavirus Special - What We Know Now

128: Horizon Horizon Special: The Vaccine

999: Horizon Delete