Moffat fucked it up.
No seriously, this episode was so disappointing. There was a couple of good moments sprinkled throughout it but that was it. To wit:
-The Master was wasted. He contributed barely nothing to the episode and everything he did could of been done by Missy. Also he shot Missy so FUCK HIM.
-Speaking of, fuck you Moffat for killing off Missy solely so Chibnall can't use her. Although I call BS that she can't regenerate. Time Lords can take loads of punishment before regenerating and a laser kills her for good? Nah fam.
-(I'm deliberately ignoring the boner joke because No.)
-The Cybermen, being finally written as anything other then stompy robots in the previous episode immediately revert to being stompy robots.
-oh wow heathers back shocker.
-oh wow bill survived shocker. Basically Clara 2.0 as well because it went down so great the first time.
-Nardole was great in this episode. In fact he's been great all season. I will miss him greatly.
-How can Heather fly the TARDIS? (Moffat: cause she's a pilot or some shit i dunno)
-oh wow the doctor survived shocker. But a tear? really Moffat?
-On top of that, the companion montage was a bit cringy (and they missed Rory and Mickey
but they included Jack so yay?)
-Speaking of: how did the Doctor see Clara when he forgot who she was and what she looked like in the previous series?
-Why doesn't the Doctor want to regenerate again? Is this David Tennant 2.0?
-oh wow 1st doctor shocker (in fairness it would of been a shocker had it not been leaked like 4 months ago so i can't really blame that on Moffat/the BBC)
-David Bradley was amazing in Adventure in Space and Time so i have some hope for Christmas.
In short: this episode sucked. Much like this season. Either I've grown out of Doctor Who or i set my expectations way too high but this series was nowhere near the quality of Series 9. Christmas better be amazing.