Overall enjoyed the episode and indeed reading everyone’s thoughts.
Only seen the episode once so apologies in advance if I’m completely off the mark.
The first thing I’d like to question is ive seen a few people mention the colour of the beam shot at missy was different to when Osgood and others were ‘killed’ earlier in the episode so therefore could be some kind of teleport. Wouldn’t the beam have been a different colour due to it coming from the CyberBrig as opposed to Missys Zapper?
Secondly, a running theme of the series / episode is lieing so on that basis, early on in the episode the Doctor whispered something to Osgood just before he was put to sleep. How do we know Osgood was telling the truth when saying ‘Guard the Graves’? Linking in with this point just before Missy killed Osgood was she not tampering with the zapper device?
Finally bit of a bonkers theory, not watched any of the old who so unsure as to whether this is possible or not? Could Osgoods sister be Missy? Its mentioned earlier The Doctor could turn the safeguards off on the Tardis and lock on to someone he knew on Galifrey to potentially find it. Could it work the opposite way? Missy locking on to her sister from Galifrey to escape? Osgood may have had a pocket watch? When 10 & 11 altered with the memories in DotD could that have caused her to remember? Osgood identified Missy as the Master straight away and didn’t seem overly concerned by the whole countdown. The way Missy teases Osgood in that scene couldbe seen as siblingy. Its bonkers and there is a couple of things that throw the whole thing into doubt but this is Doctor who ….
