Vallance's Silver Poison Capsules

Lethal sabotage tool used exclusively by Vallance under Cyberman coercion to poison the station's air supply. Their failure becomes a critical plot point when the crew switches to emergency supplies.

2 appearances

Purpose

Convert oxygen to pure ozone, asphyxiating humans by poisoning the station's air supply sections

Significance

Drives Cybermen Phase One sabotage; failure exposes crew foreknowledge of their tactics, forcing Planner to launch full identity scans and advance to systematic elimination of threats

Appearances in the Narrative

When this object appears and how it's used

2 moments

S5E39 · The Wheel In Space Part 5

Cybermen weaponize oxygen supply

The small box of silver capsules is the physical manifestation of the Cybermen’s insidious plan to sabotage the station’s oxygen supply. Carried by Vallance under the Cyberman’s direction, the box contains the silver capsules that, when inserted into the air supply system, will convert oxygen into pure ozone—a silent, invisible killer. The box is compact, unassuming, and deceptively deadly, its contents gleaming with a cold, metallic sheen that belies their lethal purpose. Its role in this event is not just functional but symbolic: it represents the Cybermen’s ability to turn the station’s life-support systems into weapons of mass destruction, exploiting human infrastructure against its creators.

Before: The box is in Vallance’s possession, carried into the oxygen supply room under the Cyberman’s supervision. Its contents—silver capsules—are intact and ready for deployment.

After: The box is now empty, its silver capsules inserted into the station’s air supply system. The box itself may remain in Vallance’s hands or be discarded, but its purpose has been fulfilled: the sabotage is underway.

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S5E40 · The Wheel In Space Part 6

Cybermen escalate identity scans after sabotage failure

The silver poison capsules, though not physically present in this scene, are referenced as the failed tool of sabotage. Vallance reveals that the crew switched to an emergency supply protected by a force field, rendering the capsules ineffective. This failure forces the Cybermen to shift their strategy from direct poisoning to systematic infiltration, marking a critical escalation in their tactics. The capsules symbolize the Cybermen’s initial approach to control the station, which is now rendered obsolete by the crew’s defensive measures.

Before: Inserted into the air supply system by Vallance, but neutralized by the crew’s switch to the emergency supply.

After: Inert and ineffective, as the crew’s defensive measures have thwarted their intended purpose.

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