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Season guide

Horizon: 1986

22 episodes Premiered Jan 6, 1986 Updated Sep 25, 2026
Previously on Horizon

Season 23 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 22.
  • ⚡ 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 23 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 23 Progress Shield

Future titles & synopses blurred. Tap "Reveal" on any card to peek.
Binge Efficiency Engine

Season 23: Filler vs. Essential Canon

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

14%
86%
Mytharc (3): Crucial lore & season climaxes
Core (19): Character development & subplots
Side Quest (0): Standalone / filler
S23·E1 Mytharc

Are You a Racist?

Jan 6, 1986 · 60 min

Horizon presents a documentary about how white racists and black victims of racism volunteered to spend time in an isolated house living and talking about their prejudices.

S23·E2 Core

Genesis

Jan 13, 1986 · 60 min

This Horizon episode is about the discovery of a molecular key which may literally unlock the mystery of life for all creatures.

S23·E3 Core

Bitter Cold

Jan 20, 1986 · 60 min

Horizon presents a documentary on scientists who take themselves to Antarctica in 1980 to act as physical and mental guinea pigs.

S23·E5 Core

Outbreak: The Microbe Masters the Mould

Feb 3, 1986 · 60 min

In this episode, Horizon explores the question of when antibiotics were first developed it seemed infectious disease might be eliminated, so what has gone wrong?

S23·E6 Core

Science...Fiction?

Feb 17, 1986 · 60 min

Horizon investigates the truths of science and it's theories.

S23·E7 Core

The Children of Eve

Feb 24, 1986 · 60 min

Horizon explores at the latest discoveries about just where modern man came from.

S23·E8 Core

The New Face of Leprosy

Mar 3, 1986 · 60 min

This episode of Horizon documents leprosy in the USA and India with a focus on medical developments for it's cure and control.

S23·E9 Core

Hi-Tech à la Française

Mar 10, 1986 · 60 min

Horizon investigates the remarkable technological transformation of France over the last 25 years.

S23·E10 Core

In the Wake of HMS Sheffield

Mar 17, 1986 · 60 min

Will the new strategies and weapons introduced because of the Falklands war be a match for the next generation of weapons? Horizon presents this documentary to answer that question

S23·E11 Core

AIDS: A Strange and Deadly Virus

Mar 24, 1986 · 60 min

Horizon looks at the virus that causes AIDS and the research into vaccines and drugs being developed to counteract the devastating disease of the immune system.

S23·E12 Core

The Case of the Frozen Addict

Apr 7, 1986 · 60 min

In this documentary, Horizon reports on how doctors in America found that addicts using designer drugs developed Parkinson's Disease-like symptoms.

S23·E13 Core

Nice Guys Finish First

Apr 14, 1986 · 60 min

In the interview by Horizon, Richard Dawkins discusses selfishness and cooperation, arguing that evolution often favours co-operative behaviour, and focusing especially on the tit

S23·E14 Core

The Men Who Bottled a Cow

Apr 21, 1986 · 60 min

This is an interesting Horizon presentation on decoys that look and smell like cows to the tsetse fly who carry a disease fatal to farm animals.

S23·E16 Core

What Makes an Animal Smart?

May 12, 1986 · 60 min

This report by Horizon takes a look at the instinctive side of intelligence in animals that shows us that we owe more to instinct than we may care to think.

S23·E18 Core

Uranus Encounter

May 26, 1986 · 60 min

In this episode, Horizon brings you Voyager's encounter with Uranus and the mysteries that are being relayed back to the scientists.

S23·E19 Core

Who Built Stonehenge?

Jun 9, 1986 · 60 min

Horizon presents an interview with Prof. C. Renfrew as he questions the accepted wisdom about the origins of Stonehenge in England.

S23·E23 Mytharc

Doctors to Be

Jun 30, 1986 · 60 min

In a unique project, Horizon follows a group of medical students into the next century.

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