| 1973 | Horizon Season 1973 Episode 33 – Kula, a Reason for Giving | | 0 | 10 years |
| Horizon Season 1973 Episode 32 – Digging Up the Future | | 0 | 10 years |
| Horizon Season 1973 Episode 31 – An Element of Mystery | | 0 | 10 years |
| Horizon Season 1973 Episode 30 – Air Crash Detective | | 0 | 10 years |
| Horizon Season 1973 Episode 29 – Carry on Smoking | | 0 | 10 years |
| Horizon Season 1973 Episode 28 – The Steadfast Tin Soldier | | 0 | 10 years |
| Horizon Season 1973 Episode 27 – What’s so Big About Us? | | 0 | 10 years |
| Horizon Season 1973 Episode 26 – Black Holes of Gravity | | 0 | 10 years |
| Horizon Season 1973 Episode 25 – Gilding the Lily | | 0 | 10 years |
| Horizon Season 1973 Episode 24 – Stretch Up Tall | | 0 | 10 years |
| Horizon Season 1973 Episode 23 – In Search of Konrad Lorenz | | 0 | 10 years |
| Horizon Season 1973 Episode 22 – A Scientist Looks at Religion | | 0 | 10 years |
| Horizon Season 1973 Episode 21 – How Does It Hurt? | | 0 | 10 years |
| Horizon Season 1973 Episode 20 – The Rat Man | | 0 | 10 years |
| Horizon Season 1973 Episode 19 – The Telly of Tomorrow | | 0 | 10 years |
| Horizon Season 1973 Episode 18 – Do We Really Need the Railways? | | 0 | 10 years |
| Horizon Season 1973 Episode 17 – The Laws of the Land | | 0 | 10 years |
| Horizon Season 1973 Episode 16 – What a Waste! | | 0 | 10 years |
| Horizon Season 1973 Episode 15 – Do You Remember the Memory Man? | | 0 | 10 years |
| Horizon Season 1973 Episode 14 – Airport | | 0 | 10 years |
| Horizon Season 1973 Episode 13 – Lumbered With Back-Ache! | | 0 | 10 years |
| Horizon Season 1973 Episode 12 – Red Sea Coral and the Crown of Thorns | | 0 | 10 years |
| Horizon Season 1973 Episode 11 – Survival of the Weakest | | 0 | 10 years |
| Horizon Season 1973 Episode 10 – What Time is Your Body? | | 0 | 10 years |
| Horizon Season 1973 Episode 9 – Acupuncture: A Chinese Puzzle | | 0 | 10 years |
| Horizon Season 1973 Episode 8 – …And Where Will the Children Play? | | 0 | 10 years |
| Horizon Season 1973 Episode 7 – Science is Dead, Long Live Science | | 0 | 10 years |
| Horizon Season 1973 Episode 6 – When the Breeding Has to Stop | | 0 | 10 years |
| Horizon Season 1973 Episode 5 – Crime Lab | | 0 | 10 years |
| Horizon Season 1973 Episode 4 – The Curtain of Silence | | 0 | 10 years |
| Horizon Season 1973 Episode 3 – The Military Necessity | | 0 | 10 years |
| Horizon Season 1973 Episode 2 – Worlds in Collision | | 0 | 10 years |
| Horizon Season 1973 Episode 1 – Epidemic | | 0 | 10 years |
