Doctor Who (2005) S12 E10
Lyrad8791 -2 points 4 years ago. (Contains Spoilers)

I can’t say anything about the regeneration cycles but, I can say that the Master and Doctor were childhood friends. I believe that has been pointed to in multiple episodes across the series thus far. Personally, I am not watching anything written or directed in the current setup, so don’t know what has been changed.

nikkimckelvy 0 points 4 years ago. (Contains Spoilers)

Clearly they were friends before the Master went insane. I’ve watched the series for decades and usually love every second. Their previous friendship is also part of cannon. What has also been long established as cannon is that there are only 12 regenerations available. One of the flaws in the series is that the Master is currently at more than 15 regenerations, and the Doctor is currently on regeneration 14. Many Whovians, myself included, have long desired an explanation for this. This episode is an attempt to provide that, and it fails abysmally. The viewer is left with more questions than answers; hence my confusion.