The Grounders

Lore & Background

Before the 100 descend, the Ark's leadership has spent decades teaching its population that Earth is a dead, irradiated wasteland—safe to colonize but empty of people. The moment the first 100 hit the ground and are hunted by armed, tattooed warriors, that narrative collapses. The Grounders reveal themselves as a living culture: the Mountain Men, for instance, organize around a fierce matriarchal warrior named Echo, who commands loyalty through both martial prowess and a code of honor that values strength, loyalty, and the protection of one's territory.

As the series unfolds, the Grounders are shown to be politically fragmented. The Mountain Men are the most visible tribe, but other groups exist across the landscape, each with its own leaders and rivalries. Jaha, a former Ark leader who was among the 100, seizes an opportunity to reshape the surface political order, positioning himself as a unifying figure among the tribes while pursuing his own vision of a new Earth society. His rise transforms the Grounders from a loose collection of warbands into something closer to a nascent government, complete with councils, alliances, and internal power struggles.

Culturally, the Grounders carry the trauma of the old world's destruction in their stories and rituals. They remember the sky-fall—the nuclear war that killed nearly everyone—and their oral traditions frame the Ark's people as either saviors or invaders depending on who is telling the story. This duality is central to the tension between the two groups: the 100 see themselves as reclaiming a world that was abandoned, while the Grounders see their home being stolen by a privileged few who had the luxury of leaving.

In Their Own Story

The wind off the ridge carried the smell of woodsmoke and old blood. Echo stood at the edge of the clearing, her painted face catching the low amber light, and listened to the silence that followed the Ark-drop. Three of the sky-fallen lay dead in the grass, their strange white suits torn open. The others huddled together, small and shaking, their eyes wide with a fear she recognized because she had worn it herself, years ago, when the first bombs turned the sky to fire.

She raised her hand. The warriors behind her held their axes still.

'You think you own this ground,' she said, her voice flat and low, 'because you fell from the sky. But we were here when the sky fell. We buried the dead. We grew the food. We bled for every inch of this dirt.' She stepped forward, close enough that one of the 100 flinched. 'So the question is not whether you get to stay. The question is whether you can earn it.'

Behind her, the Mountain Men shifted their weight, axes catching the light. The sky-fallen said nothing. There was nothing to say. The ground beneath their boots belonged to someone, and that someone was standing ten feet away, waiting to see what they would do next.

Reader's Guide

RECORD OF THE SURFACE, compiled from tribal oral histories and Ark retrieval logs. Status: partially verified; several accounts conflict.

The First Falling. All surface tribes preserve a memory of the sky burning. Accounts differ on whether it was a single night or a season of fire, but the consensus is that the old cities fell and the sky-people fled upward. The Mountain Men call this the Sky-Fall; other tribes use different names. What is confirmed: the surface population was reduced to scattered survivors who rebuilt in small, isolated groups over roughly three generations.

The Sky-Fallen Come Down. In the current era, a group of young people was dropped from the Ark. Initial contact with the Mountain Men was violent. Echo, their war-leader, treated the newcomers as trespassers. Over time, some 100 integrated into surface life while others maintained separation. This period is the most contested in the record: the 100 describe it as survival; the Grounders describe it as occupation.

The Jaha Schism. A former Ark leader, Jaha, aligned himself with the surface tribes and attempted to forge a unified political structure. His methods and motives remain debated. Some tribal accounts credit him with ending inter-tribal warfare; others record him as a conqueror who used the 100's technology to subjugate independent groups. Fan speculation often frames him as a liberator; the in-universe record is more ambiguous.

Note: The Ark's official history long denied the existence of surface people. This denial is now considered a deliberate policy, not a factual error. How and when the truth was suppressed remains under investigation.

Did You Know?

• The Ark's leadership taught its population for decades that Earth was uninhabited, making the Grounders' existence a deliberate state secret rather than a simple oversight.
• Echo, the Mountain Men's leader, is one of the few surface characters whose personal backstory and moral code are explored in depth, making her a recurring moral counterpoint to the 100's leadership.
• Jaha's transformation from a 100 member into a political figure among the Grounders is one of the show's most discussed character arcs, blurring the line between 'sky-fallen' and 'surface-dweller.'
• The Grounders are not a single tribe but a collective term; the Mountain Men are the most prominent group shown, but other tribal factions exist across the surface with their own leaders and territories.