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Season guide

Horizon: 1976

30 episodes Premiered Jan 5, 1976 Updated Sep 25, 2026
Previously on Horizon

Season 13 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 12.
  • ⚡ 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 13 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 13 Progress Shield

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Binge Efficiency Engine

Season 13: Filler vs. Essential Canon

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

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90%
Mytharc (3): Crucial lore & season climaxes
Core (27): Character development & subplots
Side Quest (0): Standalone / filler
S13·E1 Mytharc

The Transplant Experience

Jan 5, 1976 · 60 min

Horizon investigates heart transplant research and techniques perfected and currently used by Dr. Norman Shumway in Britain.

S13·E2 Core

Intimate Strangers

Jan 12, 1976 · 60 min

This episode of Horizon is about symbiosis - the close association between two or more species for their mutual benefit.

S13·E3 Core

A Fair Share of What Little We Have

Jan 19, 1976 · 60 min

Horizon reports on the country of Tanzania, a country that spends only one dollar per person on health services, and more than half of all children born there die before the age of

S13·E4 Core

The Incredible Machine

Jan 26, 1976 · 60 min

This episode of Horizon explores what actually happens inside our bodies using new optical techniques.

S13·E5 Core

King Coal Revived

Feb 2, 1976 · 60 min

Horizon examines the projected expansion of the coal mining industry.

S13·E6 Core

A Question of Trust

Feb 9, 1976 · 60 min

In this episode of Horizon, we look at the need for confidence in the doctor to patient relationship.

S13·E8 Core

The Lords of the Labyrinth

Feb 23, 1976 · 60 min

Horizon traces back the origins and development of the pre-Incan Chimu civilization of Peru.

S13·E9 Core

Inside the Shark

Mar 1, 1976 · 60 min

This documentary by Horizon takes a look at the shark, the supreme predator of the sea.

S13·E10 Core

The Chemical Dream

Mar 8, 1976 · 60 min

Horizon reports on enzymes and the way they are being put on work in the industry and medicine fields.

S13·E11 Core

The Edelin Affair

Mar 15, 1976 · 60 min

This is a Horizon reconstruction of the trial of Dr. Kenneth Edelin who was arrested after performing an abortion in 1973.

S13·E12 Core

The World of Margaret Mead

Mar 22, 1976 · 60 min

This Horizon reports is about Margaret Mead, who at age 74, is one of America's most influential social scientists.

S13·E13 Core

The Pathway from Madness

Mar 29, 1976 · 60 min

Horizon investigates the developments in and the treatment of schizophrenia.

S13·E14 Core

Geronimo's Children

Apr 5, 1976 · 60 min

This report by Horizon investigates the aggressive and oppressive history of the Mescalero and Chiricuhua Apache Indians of New Mexico in the USA.

S13·E15 Core

The Vision of the Blind

Apr 12, 1976 · 60 min

This Horizon documentary investigates the ways that the blind and partially blind are aided.

S13·E16 Core

A Lesson for Teachers

Apr 26, 1976 · 60 min

Horizon explores the comparative research study into progressive versus formal primary school teaching in the UK.

S13·E17 Core

Why Did Stuart Die?

May 3, 1976 · 60 min

This episode of Horizon delves in the research into the causes for, and the methods of eradicating 'cot deaths' in Britain.

S13·E18 Core

The Children of Peru

May 17, 1976 · 60 min

Horizon looks at food production in Peru today.

S13·E19 Core

Dying

May 24, 1976 · 60 min

This is a Horizon documentary on how a widow faces the last day of her husband's life and the story of three other people who know they only have a short time to live.

S13·E21 Core

What's Wrong with the Sun?

Jun 14, 1976 · 60 min

In the episode, Horizon explores the history of man's understanding of the sun's structure and observations in recent years.

S13·E22 Core

The Bull's Eye War

Oct 25, 1976 · 60 min

Horizon looks at today's precision guided weapons.

S13·E23 Core

The Hot-Blooded Dinosaurs

Nov 1, 1976 · 60 min

Horizon makes an investigation into claims by a group of scientists who theorize that dinosaurs were not actaully cold-blooded reptiles, but hot-blooded, like mammals.

S13·E24 Core

Billion Dollar Bubble

Nov 8, 1976 · 60 min

This is an investigative report by Horizon that shows how the Equity Funding Corp. of America produced two billion dollars worth of phoney insurance.

S13·E25 Core

The Selfish Gene

Nov 15, 1976 · 60 min

This Horizon documentary explores animal behavior. Animals do not act for the good of their own species, rather for the preservation of their own genes.

S13·E26 Core

A Child of Our Own

Nov 22, 1976 · 60 min

This episode of Horizon is about infertility and the state of British scientific research in this area.

S13·E27 Core

Secrets of a Coral Island

Nov 29, 1976 · 60 min

Horizon reports on Pacific Ocean fishermen who are famous for their extraordinary fishing skills. They catch fish with a kite and a tassel of spiders webs.

S13·E28 Core

The Long Valley

Dec 6, 1976 · 60 min

This is a Horizon documentary about six people who have each lost someone very close, as they describe their progress through grief.

S13·E29 Mytharc

Half-Way to 1984

Dec 13, 1976 · 60 min

Horizon looks at new developments in computer technology that have made mass surveillance possible, and also its political misuse.

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