Fabula
Object
Object

Power Conversion Matrix

The Power Conversion Matrix (PCM) is the City's central energy hub, a towering metal structure pulsing with energy that regulates all mechanical and surveillance systems. The Doctor describes it as the 'source of the Company's power,' its blue-white glow casting sharp reflections on the faces of the technicians who maintain it. Bisham knows its physical layout and vulnerabilities intimately, and the rebels plan to exploit a weak point near the primary conduit.
4 appearances

Appearances in the Narrative

When this object appears and how it's used

4 moments
S15E14 · The Sun Makers Part 2
Doctor exposes PCM's true purpose to Bisham

PCM gas is referenced through Bisham’s description of the tablets and the gas used in the Centre’s ventilation system. The Doctor deduces the gas’s true purpose as an anxiety-inducing control agent, aligning it with the Company’s systemic psychological warfare and undermining its claimed health benefits.

Before: Distributed through the Centre’s air handling system as an oppressive control mechanism, unseen and odorless.
After: Exposed and named—its function and mechanism clarified—becoming a known threat to the Doctor’s subversive aims.
View full event
S15E15 · The Sun Makers Part 3
Doctor rallies rebels to strike at the heart of Company power

The Power Conversion Matrix is central to the Doctor’s plan as the source of the Company’s power, but its vulnerability is framed not through explosives—prohibited—but through precise thermal manipulation. Bisham cites its critical temperature (205°C) as the point at which the pacifying drug in the vapor chambers becomes inert. This scientific detail transforms the PCM from an invulnerable monolith into a calculable target, shifting the rebellion’s focus from brute force to systemic manipulation and enabling the rebels to envision crippling the Company’s infrastructure.

Before: A towering, intimidating infrastructure component pulsing with dominance over the city, guarded and ill-understood by the rebels.
After: Revealed as a quantifiable system with a thermal weakness, its stature diminished by scientific insight; now a calculable target within the rebellion’s engineered plan.
View full event
S15E15 · The Sun Makers Part 3
Doctor devises plan to disable surveillance grid

The Power Conversion Matrix (PCM) becomes the symbolic and functional heart of the rebellion strategy. Bisham identifies it as the Company's power source, and the Doctor seizes on its thermodynamic vulnerability—the critical temperature threshold of 205°C—to propose nonviolent sabotage through strategic cooling. The PCM's centralized control over vapor chambers makes it the logical target for coordinated rebellion.

Before: At peak operational capacity, regulating energy and drug dissemination across the Undercity as the Company's primary control mechanism
After: Identified as a fragile node vulnerable to thermal manipulation, transforming from invulnerable infrastructure into potential point of collapse for the entire oppressive system
View full event
S15E15 · The Sun Makers Part 3
Bisham reassures Doctor about Leela

The Power Conversion Matrix is the backdrop of their strategic reasoning, with Bisham explaining its centrality to the Company’s power and the Doctor proposing a thermal destabilization plan using its vapor chambers. Though not physically present, it anchors the discussion.

Before: Operational and oppressive, regulating all mechanical and surveillance systems in the Undercity.
After: No change in physical state, but now the focus of an active plan to destabilize it via temperature manipulation.
View full event