Oxymask

From Tardis Wiki, the free Doctor Who reference
An overlord breaths through an Oxymask while on Solos. (TV: The Mutants)

Oxymasks were breathing apparatus used by the humans on Solos. They helped the humans breath in the planet's atmosphere. Skybase workers were required to have Oxymasks with them at all times.

Ky attacked an overlord and stole his mask. He gave it to Jo Grant to stop her from suffocating. (TV: The Mutants)

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