Who Is The Master? was the sixth in-universe webcast in the TARDIS Index Files series.
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- The Doctor's "best enemy", Missy's planet of origin is Gallifrey.
- As a child, the Doctor attended the Academy on Gallifrey with the individual now known as Missy. They were friends, comrades.
- Both youngsters were made to gaze into a gap in the fabric of reality that showed the Time Vortex; the raw power of time and space.
- A flight of bananas is used to illustrate the Master's mental state.
- A Celestial Intervention Agency warning forebodes Missy's corruption of the video.
- The Doctor left the Academy and became, as Missy puts it, "all goody two shoes." She on the other hand, left and became bananas.
- Across all her faces, Missy "went out to party" and spread chaos and destruction. She "fought and frolicked" with the Doctor "because that's what friends do."
- This webcast is presented as an in universe fact-file available on the TARDIS.
- The Master went mad after looking into the Untempered Schism as a child on Gallifrey. (TV: The Sound of Drums, The End of Time)
- Regenerating into a female form, the Master changed her name to "Missy." (TV: Dark Water)
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