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Macra

predatory cunning manipulative parasitic aggressive
Macra, a giant crab-like parasite, secretly rules the human colony through hypnotic gas addiction and mental conditioning. It hides in mine shafts and pipes, drawing sustenance from the gas supply while deploying claws to seize threats. Sentient and cunning, Macra coordinates attacks, broadcasts threats via disembodied voice, and manipulates human overseers like Control to enforce obedience. Fresh air weakens it, exposing reliance on the colony's toxic environment for dominance.
12 appearances
Colonial Mind Control and Gas Infrastructure
Also known as: crab-like creature

Macra's Journey

A timeline through the narrative

12 moments
S4E28 · The Macra Terror Part 2
Polly Confronts Ben’s Control and the Macra

Relentless and menacing; its actions are driven by instinct rather than malice, but its presence embodies the Colony’s suppressed violence.

The Macra lurks in the shadows of the building site, its presence initially unseen but felt through Polly’s terror. When it finally strikes, its claw seizes Polly’s leg, forcing Ben …

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S4E28 · The Macra Terror Part 2
Ben’s mind control shatters under Macra attack

Menacing and dominant (physically), yet eerily silent—its actions speak louder than any dialogue, embodying the Colony’s hidden terror.

The Macra materializes as a physical threat, its giant claw seizing Polly’s leg with terrifying force. The creature’s presence is undeniable—its insect-like face and crab-like claws match Polly’s earlier description, …

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S4E29 · The Macra Terror Part 3
Macra ambushes Medok in the shaft

None (as a creature), but its actions radiate cold, predatory intent—it is the physical manifestation of the colony's oppressive control, acting without remorse or hesitation.

The Macra's massive claw bursts from the darkness, seizing Medok by the throat with brutal efficiency and hurling him to the ground. The attack is sudden, violent, and calculated, embodying …

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S4E29 · The Macra Terror Part 3
Jamie confronts the Macra in Old Shaft

Cold, calculating satisfaction. It is in its element here—hunting, controlling, enforcing. There is no mercy, only the thrill of the kill and the reinforcement of its rule. Jamie’s defiance is irrelevant; the Macra has already won.

The Macra emerges from the Old Shaft’s shadows like a nightmare given form—its massive, crab-like body filling the space as it looms over Jamie. Its claws are extended, glistening with …

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S4E29 · The Macra Terror Part 3
Jamie tests the Macra’s restraint

Coldly predatory, exerting controlled dominance while suppressing its natural instincts.

The Macra remains motionless in the shadows of the old shaft, its breathing controlled and posture rigid, betraying a predator suppressing its instincts. When Jamie hurls a stone and a …

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S4E29 · The Macra Terror Part 3
Officia threatens Polly as Macra lurk unseen

Predatory and calculating, with a silent, looming presence that instills fear in those who sense its gaze.

The Macra is not physically present in the scene but is described as staring intently at Jamie. Its unseen presence looms over the Pithead, serving as a silent, predatory force …

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S4E30 · The Macra Terror Part 4
Doctor reverses toxic gas flow

Aggressive and relentless initially, shifting to weakened and vulnerable as the fresh air undermines their dominance.

The Macra, initially aggressive and relentless in their pursuit of Jamie in the old shaft, are weakened as the fresh air from the reversed gas flow floods the area. Their …

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S4E30 · The Macra Terror Part 4
Doctor reverses gas flow and escapes guards

Aggressive and desperate, as their control over the colony is challenged by the Doctor's sabotage.

The Macra are not physically present in this event but are referenced through Control's voice and the Doctor's actions. Their presence is felt through the urgency of maintaining the gas …

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S4E30 · The Macra Terror Part 4
Doctor hears whispers in forbidden shaft

None (as a non-sentient parasite in this context), but its actions radiate a sense of lurking menace and unseen power. Its feeding is methodical, almost predatory, reinforcing the idea of an invisible, all-consuming threat.

The Macra, hidden in the old shaft, is observed by the Doctor and Polly through the porthole as it inhales the colony’s toxic gas. Its presence is a silent but …

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S4E30 · The Macra Terror Part 4
Doctor and Polly witness Macra gas theft

None (as a non-sentient creature in this context), but its actions convey a sense of predatory satisfaction—it is feeding unnoticed, secure in its hidden dominance.

The Macra is observed through the porthole, its clawed appendage positioned at the gas pipe as it inhales the toxic fumes. Its presence is silent but menacing, a grotesque figure …

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S4E30 · The Macra Terror Part 4
Doctor Forces Ben’s High-Stakes Choice

Panicked aggression; its authority is being undermined, and it responds with visceral threats to reassert control.

The Macra’s voice, disembodied and guttural, erupts from the shadows of the Pipe Room, its tone a mix of rage and desperation. It screams threats of annihilation, accusing the Doctor …

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S4E30 · The Macra Terror Part 4
Ben's sabotage erupts in the Pithead

Panicked and exposed—their control crumbling under the weight of the sabotage, with no ability to retaliate directly in this moment of chaos.

The Macra’s hidden infrastructure beneath the Pithead is violently destroyed by Ben’s sabotage, as the explosions rip through their concealed conduits and machinery. The blasts expose their parasitic regime, forcing …

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Affiliations

The Colony (Governance & Infrastructure)
leader
Totalitarian Colonial Governance and Macra-Controlled Gas Infrastructure

The Macra infiltrates and dominates the Colony, manipulating its governance and infrastructure to control the human inhabitants. It functions as a central figure, pulling the strings from behind the scenes.

Macra
member
Parasitic Domination of Colony Infrastructure and Population

The Macra operates as a collective of parasitic insects that infiltrate the colony. Given the agent is explicitly named 'Macra', it is clearly a member.

Across the Seasons

How this character reads at season scale

Season 4 · planet

Macra, a giant crab-like parasite, secretly rules the human colony through hypnotic gas addiction and mental conditioning. It hides in mine shafts and pipes, drawing sustenance from the gas supply while deploying claws to seize threats. Sentient and cunning, Macra coordinates attacks, broadcasts threats via disembodied voice, and manipulates human overseers like Control to enforce obedience. Fresh air weakens it, exposing reliance on the colony's toxic environment for dominance.