The 100

Lore & Background

In the world of The 100, a nuclear exchange roughly a century before the series' opening destroyed surface infrastructure, poisoned the atmosphere, and killed nearly all of humanity. The survivors retreated into the Ark, a massive orbital habitat where the last of the species lived in a stratified, ration-controlled society. For nearly a century, Earth was treated as a myth—a toxic wasteland no one was permitted to visit. The 100 juveniles sent down in the pilot represent the Ark's first serious attempt to test whether the planet has recovered.

Beneath the surface, humanity had not simply perished. Small groups of survivors adapted over generations, developing distinct tribal cultures, oral histories, and spiritual frameworks that bore little resemblance to the pre-war world. These surface communities, collectively called Grounders, had their own governance, religious practices, and deep-seated fear of the sky. The collision between the Ark's utilitarian, technology-dependent culture and the Grounders' organic, tradition-bound societies forms the show's enduring central tension.

As the series progresses, the scope widens: the Ark itself becomes a site of political intrigue and resource scarcity; new factions emerge from the wreckage of old alliances; and the question of who gets to define 'humanity' and who gets to be excluded grows more urgent with each revelation. The show's later seasons push into more speculative territory—genetic manipulation, ancient pre-war technology, and the possibility that the nuclear war was not the first catastrophe—while maintaining its core focus on how ordinary people make extraordinary, often terrible, choices under pressure.

In Their Own Story

The drop pod shuddered through the last stretch of atmosphere, and Clarke pressed her forehead against the cold porthole glass. Below, the Earth was not the grey, irradiated hellscape the Ark's sensors had painted for ninety-seven years. There was green. Actual, impossible green, stretching in a river of forest toward a coastline that glittered under a sun she had never seen without the Ark's filtered dome between her and it. She could feel the gravity shifting, her bones remembering a weight they had never known. Around her, the other delinquents were silent—not the respectful quiet of the Ark's corridors, but the raw, animal silence of people who understood that in an hour they would be either the first humans to walk on this world in a century, or the last. The pod's thrusters fired one final time, and the ground rushed up to meet them like a promise no one had earned.

Reader's Guide

Recovered from a surface-dweller's oral-history cache, the following is a composite account as it would have been passed down in the Grounders' early centuries, contrasted with Ark records.

In the earliest surface traditions, the 'Sky-Fire' is remembered not as a war but as a punishment—a divine act that scoured the land of the 'loud ones' who had poisoned the rivers. The Ark, in its official archive, records the same event as a strategic nuclear exchange between nation-states, with no theological framing. Both accounts agree on the outcome: the surface was dead, the sky was toxic, and the survivors fled upward.

The 97-year gap is where the two histories diverge most sharply. Ark records describe a single, continuous chain of command aboard the station. Grounder oral tradition describes a slow, generational forgetting—each generation adding a new cautionary tale, until the 'Sky People' became a myth no one fully believed. Fan speculation has suggested that some surface groups may have retained fragments of pre-war technology far longer than the Ark assumed, though this remains unconfirmed within the series' own narrative.

As the characters in the show learn the true history—piecing together pre-war data, encountering surviving technology, and confronting the Ark's own political manipulation of the truth—their understanding shifts from 'we are the inheritors of a dead world' to 'we are the inheritors of a lie.' This reframing is the show's central mythological arc: history is not a fixed record but a story told by whoever holds the pen, and the truth is always more complicated than the founding narrative allows.

Did You Know?

• The show's premise—sending juvenile offenders to test a potentially dead planet—was designed to frame the entire series as a moral experiment: what happens when the 'worst' members of a society are given the chance to de
• The Grounders' society, with its tribal governance, spiritual practices, and oral traditions, was deliberately modeled on a wide range of Indigenous and pre-industrial cultures to contrast with the Ark's sterile, technoc
• The Ark's population is kept at a strict cap throughout the series, and the political tension over who is 'allowed' to live aboard drives much of the station-based conflict in the later seasons.
• The show's title refers not to a military unit or a political faction but to a single, specific group of 100 teenagers whose names and fancies are tracked across all seven seasons, making it one of the most character-den