Fabula
Object
Object

Doctor's Vital Positron/Antimatter Sample Tin

A small, battered tin serving as both scientific instrument and critical evidence. It contains the Doctor's final vital positron samples—his last contribution to counter Vandervelt's equation and the antimatter threat from Zeta Minor. The tin's worn exterior contrasts with its dual significance: as a container for life-saving scientific data and as irrefutable proof of the antimatter contamination threatening the ship. Sarah's attempts to rouse the Doctor frequently center on protecting its contents, making the tin both a fragile vessel of hope and a weight of desperate responsibility.
4 appearances

Purpose

Stores and transports high-energy positron samples for scientific analysis and device calibration

Significance

Represents the Doctor’s final lifeline to solving the antimatter crisis, the crew’s last chance at survival, and a symbol of his determination to preserve their mission’s purpose despite crippling odds

Appearances in the Narrative

When this object appears and how it's used

4 moments
S13E7 · Planet of Evil Part 3
Sarah finds Doctor gasping at the rock pool

The Doctor's battered toffee tin, cradled in his weakening grip though barely conscious, holds the last vital positron samples required to counter the antimatter catastrophe. Sarah's attempts to revive him involve protecting this fragile container of scientific hope while the tin becomes both physical burden and symbolic lifeline.

Before: clutched in the Doctor's grip at the rock pool edge
After: still clenched in the Doctor's hand as he collapses
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S13E7 · Planet of Evil Part 3
Doctor confronts broken promise in sickbay crisis

The Doctor’s vital positron sample tin is extracted from his pocket as his exhaustion momentarily lifts—its battered exterior masking the critical positron samples which represent both his final contribution to physics and their only hope to counter the escalating antimatter threat defining their peril.

Before: Clutched by the weakened Doctor in his pocket, unexamined but significant as a physical reminder of his renegade obligations to complete vital work despite his collapse
After: Removed from his pocket, the tin becomes a visible symbol of his priorities shifting from verbal confusion to taking practical action, its more secure grip suggesting an attempt to protect its contents
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S13E7 · Planet of Evil Part 3
Systems fail amid Doctor’s revelation

The Doctor grips his battered tin desperately, its contents representing his last meaningful scientific achievement amid failing systems and broken promises. The tin becomes both literal crutch and psychological anchor as he fumbles to articulate the gravity of their predicament while clinging to its fragile purpose.

Before: Carried in the Doctor's pocket, intact and undamaged despite his exhaustion
After: Clutched tightly in his hand, its contents still critical but increasingly threatened by his physical collapse
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S13E7 · Planet of Evil Part 3
Doctor reveals antimatter menace to Salamar

The Doctor clutches the battered tin, raising it to display its contents as the crew’s final hope and proof of unseen contamination. Once Salamar grasps its import, the tin is forcibly consigned to Morelli for jettison via the secondary boosters, turning it from lifeline into sacrificial explosive.

Before: Clutched in the Doctor’s weak grip, its significance only privately known; exterior worn but contents intact
After: Taken by Morelli, en route to the jettison hatch, its loss imminent to prevent ship-wide annihilation
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