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Season guide

Horizon: 1973

32 episodes Premiered Jan 4, 1973 Updated Sep 25, 2026
Previously on Horizon

Season 10 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Directly follows the overarching narrative developments of Horizon Season 9.
  • ⚡ Faction dynamics and core character alliances shift under escalating external stakes.
  • ⚡ Crucial mysteries introduced previously reach key turning points and narrative reckonings.
  • ⚡ Sets up serialized story arcs that build directly toward the climactic season finale.
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Season 10 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 10 Progress Shield

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Season 10: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

9%
91%
Mytharc (3): Crucial lore & season climaxes
Core (29): Character development & subplots
Side Quest (0): Standalone / filler
S10·E1 Mytharc

Epidemic

Jan 4, 1973 · 60 min

Horizon examines sources of infection that have, and could still, cause epidemics in Britain.

S10·E2 Core

Worlds in Collision

Jan 11, 1973 · 60 min

This episode of Horizon features Immanuel Velikovsky and his theories about the solar system.

S10·E3 Core

The Military Necessity

Jan 18, 1973 · 60 min

Horizon examines the doctrines and military strategies of the rival alliances of NATO and the Warsaw Pact countries.

S10·E4 Core

The Curtain of Silence

Jan 25, 1973 · 60 min

Horizon looks into the problem of deafness in Britain.

S10·E5 Core

Crime Lab

Feb 1, 1973 · 60 min

A jewel robbery, a hit-and-run, and the Case of the Skeleton in the Sand Dunes illustrate the work of forensic scientists and the police they assist. How do they discover the chara

S10·E6 Core

When the Breeding Has to Stop

Feb 8, 1973 · 60 min

How easy is it to get sterilized? Should there be abortion on demand? Do we need a free contraceptive service? Our average family size is 2.5. To avoid a social and population cris

S10·E7 Core

Science Is Dead, Long Live Science

Feb 15, 1973 · 60 min

In this documentary by Horizon, we look at chemical warfare and the associated environmental problems that have given science a bad name.

S10·E9 Core

Acupuncture: A Chinese Puzzle

Mar 8, 1973 · 60 min

Horizon explains acupuncture theories and examines its validity in modern medicine.

S10·E10 Core

What Time Is Your Body?

Mar 22, 1973 · 60 min

Horizon illustrates the Circadian Cycle of your body clock as it relates to physical and mental efficiency.

S10·E11 Core

Survival of the Weakest

Apr 5, 1973 · 60 min

In this episode, Horizon investigates the chances of survival and chances of a normal life for babies who are born underweight.

S10·E12 Core

Red Sea Coral and the Crown of Thorns

Apr 12, 1973 · 60 min

This Horizon documentary shows the work of the Cambridge Coral Starfish Research Group off of Port Sudan in the Red Sea.

S10·E13 Core

Lumbered... with Back-Ache!

Apr 26, 1973 · 60 min

In this report, Horizon studies the problem of backache and investigates some remarkable new spine research.

S10·E14 Core

Airport

May 3, 1973 · 60 min

Horizon covers Heathrow Airport in England and in particular, the work which is being done to make it safe.

S10·E15 Core

Do You Remember the Memory Man?

May 17, 1973 · 60 min

Horizon looks at the phenomena of memory and some recent discoveries about it made by scientists.

S10·E16 Core

What a Waste!

May 24, 1973 · 60 min

Horizon investigates the various ways of dealing with the growing problem of garbage.

S10·E17 Core

The Laws of the Land

Jun 7, 1973 · 60 min

In the episode, Horizon investigates modern intensive farming methods.

S10·E18 Core

Do We Really Need the Railways?

Jun 14, 1973 · 60 min

Horizon takes a realistic look at the new ideas and technology threatening Britain's railway system.

S10·E19 Core

The Telly of Tomorrow?

Jun 21, 1973 · 60 min

In this Horizon documentary, it deals with the expansion of television in Britain and the USA, especially with the growth of cable television.

S10·E20 Core

How Does It Hurt?

Jul 5, 1973 · 60 min

In this episode of Horizon, you will find that many people suffer chronic pain and yet others cannot feel anything.

S10·E21 Core

A Scientist Looks at Religion

Aug 9, 1973 · 60 min

This report by Horizon examines the work of Sir Alister Hardy who has set up a research unit to examine religious experience.

S10·E22 Core

In Search of Konrad Lorenz

Sep 24, 1973 · 60 min

Horizon presents a portrait of Konrad Lorenz and a review of his career and personal interests.

S10·E23 Core

Stretch Up Tall

Oct 1, 1973 · 60 min

This episode of Horizon takes a look at the medical and educational treatment of spastics in Britain.

S10·E24 Core

Gilding the Lily

Oct 8, 1973 · 60 min

Horizon presents a documentary on the developments in botany resulting in new flowers and the mass production of plants from single cells.

S10·E25 Core

The Black Holes of Gravity

Oct 15, 1973 · 60 min

In this episode of Horizon, Prof. John Taylor of the London University looks at the effects of gravity and the forces it exerts on the universe.

S10·E26 Core

What's so Big About Us?

Oct 22, 1973 · 60 min

Horizon investigates the plight of the Pygmies, on the verge of extinction as a racial group.

S10·E27 Core

The Steadfast Tin Soldier

Oct 29, 1973 · 60 min

This Horizon documentary is a biography of the Danish nuclear physicist, Nils Bohr, and his efforts to internationally control atomic energy.

S10·E28 Core

Carry on Smoking

Nov 5, 1973 · 60 min

Horizon looks at the rise in the number of people who smoke and the real health risks.

S10·E29 Core

Air Crash Detective

Nov 26, 1973 · 60 min

In this report, Horizon investigates why airplanes crash and shows accident investigators at work analyzing a film of an actual crash.

S10·E30 Core

An Element of Mystery

Dec 3, 1973 · 60 min

This episode of Horizon documents the sources, uses, and properties of the element mercury and examines its role in modern society.

S10·E31 Mytharc

Digging Up the Future

Dec 17, 1973 · 60 min

Can we ever hope to wipe out diseases like influenza and small-pox? Will our weather get better - or worse? Is it possible to grow anything useful on large areas of moorland in thi

S10·E32 Mytharc

Kula, a Reason for Giving

Dec 24, 1973 · 60 min

Horizon reports on the inhabitants islands east of New Guinea who have evolved a system of intercommunication called the Kula.

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