Doctor Who
Object

Master's Oxygen Mask

A medical revival device used by the Master to counteract sleep gas and restore the Doctor's consciousness in the TARDIS. Distinct from other Master-owned tools due to its personal, close-proximity application and emergency revival function.
2 appearances

Purpose

Deliver oxygen to revive targets from sleep gas-induced unconsciousness

Significance

The Master times its use perfectly to awaken the Doctor and dangle Jo as hostage, breaking his resistance and compelling him to navigate to the Primitive city.

Appearances in the Narrative

When this object appears and how it's used

2 moments
S8E19 · Colony In Space Part 5
Master blackmails Doctor with hostage

The oxygen mask is a critical tool in the Master’s psychological warfare, used to revive the Doctor from sleep gas-induced unconsciousness. Its application is clinical and calculated, symbolizing the Master’s control over the Doctor’s very breath and awareness. The mask’s clear visor fogs briefly as the Doctor takes his first breaths, a visceral reminder of his vulnerability. The object serves a dual purpose: it restores the Doctor to consciousness so the Master can manipulate him, and it underscores the Master’s dominance by controlling even the Doctor’s basic physiological needs.

Before: Stored and ready for use by the Master, likely part of his TARDIS’s medical or security systems.
After: Returned to its storage location after being used to revive the Doctor, now a symbol of the Master’s control over the situation.
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S8E19 · Colony In Space Part 5
Master blackmails Doctor with Jo hostage

The oxygen mask is a critical tool in the Master’s revival of the Doctor, symbolizing both his control and the Doctor’s physical vulnerability. As the Master presses it over the Doctor’s face, the mask becomes a metaphor for the Master’s dominance—he dictates when the Doctor wakes, how he breathes, and ultimately, how he complies. The mask’s clear visor fogging with the Doctor’s first breaths visually reinforces the tension between life and control in this moment.

Before: Ready and in the Master’s possession, primed for use to revive the Doctor.
After: Used once to revive the Doctor, now likely set aside but still a potential tool for further manipulation.
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