Ad blocker interference detected!
Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers
Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.
Sleeping gas was an anaesthetic used to incapacitate its subject.
After the Third Doctor stole the dematerialisation circuit from his TARDIS, the Master installed an alarm system that triggered the release of sleeping gas into his console room. It was activated by Jo Grant resulting in the incapacitation of both her and the Doctor. The Master was able to revive them though the use of an oxygen mask.