To simplify things, I'll sort everything into five categories: The Doctor, The Companion(s), The Monster, The Plot, and The Series Arc.
The Doctor:
Peter Capaldi is stunning as always in this episode, and the script gives us a lot of really great dialogue and monologue from the Doctor. The obvious standout moment is the revelation of Twelve's face, and why he chose it. I've been waiting for this revelation since "Deep Breath", and I'm glad it's finally come to fruition.
The reveal itself is something less monumental than I expected, but not in a disappointing sense. I almost didn't want Capaldi's face to be a huge, story-arc type thing, so I felt this was a very fitting answer to the question: “Who frowned me this face?” It seemed very appropriate that this Doctor, being the grumpy, pessimistic fellow that he is, would need a reminder of who he is, and what he does.
Speaking of Twelve's pessimism, it was very well displayed in this episode, leading very naturally into the face reveal. Capaldi is really just an amazing actor, and Doctor Who is lucky to have him.
The Companion(s):
I cannot say enough good things about the current TARDIS team. I do believe we have never had such an incredible duo of actors, with such a genuine, unique, and believable dynamic. Jenna Coleman was fantastic, and although one of Clara's conversations with the Doctor was slightly repetitive of the one in Under the Lake, I felt they brought a fresh perspective and urgency to the question of Clara's departure(which I'll discuss in the Series Arc section). Most of their conversations, however, were new, unexplored territory, such as their conversation regarding the baby's crying. Clara's path of becoming more and more like the Doctor, explored in Series 8, is obviously complete, as her confrontation with 'Odin' proves. She even told Ashildr to shut up.
For all intents and purposes, Maisie Williams' Ashildr acts as a secondary companion in this episode, both to Clara in the first half on board the Mire's spaceship and to the Doctor in the final confrontation with the Mire. Perhaps it was just me, but I found Ashildr to be slightly underdeveloped. So much could have been done with the material presented in that her impulsiveness was going to be the cause of her own destruction and the destruction of her entire village. However, I will hold out judgment on her character until next week.
The Monster:
Ah, yes, the Mire. I read a pre-air review that said the Mire were a rather silly monster, and certainly not 'the deadliest warrior race in the galaxy'. Which I certainly agree with. The 'deadliest race' is often used as a hook to keep viewers watching or attract viewers. Which is fine, I suppose, but I'd like to see it be true for once. In fact, the Mire may well have been a great warrior race in an actual battle, but the final confrontation was less a battle than a trick.
However, this doesn't mean I dislike the monster. Indeed, I found them a threatening force and so did the Doctor, apparently. Heck, they ground up an army for an energy drink(Which, by the way, did anyone else find that incredibly awkward and creepy?)
Their humiliation was slightly contrived(they should have been able to kill at least one person), but I suppose it's forgivable, as the Doctor's plan was to humiliate them.
The Plot:
I've covered most of this with the previous section, but there are a few things I want to say.
I really enjoyed the tension of the 20 minutes between Ashildr's declaration of war and the final battle, but wish a little bit of the humour there had been cut out to preserve the feeling of tension.
As far as pacing, the episode seemed fairly consistent, if a bit rushed. I had gotten so used to two-parters that I missed the slow, tense, development of Under the Lake/Before the Flood.
As far as humour, this episode is, admittedly, pretty darn funny. I especially like the pre-title scenes.
The Series Arc:
Ah, this is where the fun begins. You all know how I love to theorize, and this episode gives ground for a lot of quite intriguing theories.
We'll start with Ashildr. I must say, I'm quite excited for next week. I can't wait to see what scars immortality has inflicted on the innocent dreamer we saw this week. It'll be heartbreaking, but oh so intriguing. It almost seems as though she may be something of a villain.
However, I do not think she is the hybrid that Davros spoke of in “The Magician's Apprentice”. No, that's just too simple. Allow me to present a different theory as to the hybrid. I present, Clara Oswald.
“Oh, really?”, you say? Yes, really. Consider for a moment what the Doctor has said about Clara this season. She's “Someone he can't bear to lose”. Someday the very thought of her will hurt. He's scared something might happen to her. A lot of people point to these lines as evidence that Clara will die. And I won't disagree, it does seem the obvious implication. But is it, perhaps, a bit too obvious?
C'mon, we know Moffat. Foreshadowing is very like him, but not like this. This foreshadowing is far too overt. It just screams “Look, Clara's going to die!”. I don't buy it. Yes, perhaps Clara will die, but if she does, I'd bet money the Doctor brings her back. The Doctor's despair at her apparent death in “The Magician's Apprentice” shows just how much he cares about Clara. His claim that he's “changing time to save Clara” in “Before the Flood” shows how far he's willing to go to keep her alive. If the Doctor was willing to create a so-called “tidal wave” to save a Viking girl he's known for a day, how much do you think it would take for him to resurrect his beloved companion? Could the Doctor potentially make Clara immortal?
The answer is absolutely yes. But we have confirmation that Jenna Coleman is leaving Doctor Who this season(

). This leaves us with only one form of immortality: regeneration. “But Clara isn't a Time Lady!”, you protest. While I maintain she could very well be, she may not have to be a Time Lady to regenerate. You may remember that I commented that since “The Magician's Apprentice” revealed that the Doctor can use regeneration energy on demand, he may one day use it to resurrect a companion. We know a Time Lord can gift their regenerations, and use them to resurrect a dead Time Lord(“Let's Kill Hitler”). Thus, the only question is, is regeneration energy compatible with human anatomy? Considering the only known difference between Time Lords and humans is that they have two hearts, we can assume that any issues would lie there. My guess is that regeneration works because when one heart stops, the other can remain beating long enough to begin the process of regeneration. Thus, someone who was already dead wouldn't need two hearts. So, in theory, Clara's regeneration is completely feasible.
Clara's regeneration would make her a hybrid, and one of great enough importance to be the one Davros spoke of, because she would be half Time Lord, half human. “But humans are not a great warrior race!”, you argue. No, but Clara Oswald is a great warrior, almost of the Doctor's own caliber. A combination of the Doctor and Clara would be just the thing to fulfill that prophecy.
But what ramifications could Doctor Oswald(as I dub this hybrid) have? Some would argue she would end up like Donna, being forced to have her memory wiped to save her life. But there's a subtle difference here. Donna became a literal Time Lord/Human. Clara's regeneration would leave her fully human, not changing her physical anatomy, only resurrecting her from death, and just possibly giving her the ability to regenerate in the future(as the Doctor probably doesn't know exactly the amount of regeneration energy required to regenerate, he would probably use an excess amount like River did).
But what would Doctor Oswald become? With Clara's recent developments, she has become the Doctor's equal on all counts except her mortality. If she gained immortality and regenerated into a completely new person with a new personality, might she just become the greatest villain in Doctor Who history? Just some food for thought.
But that's not my only theory, of course. The other one is much simpler and perhaps more poignant. If the Doctor simply cannot bear to lose Clara, might he abandon her on Earth to keep her safe from the dangers of traveling with him? Some
filming pictures and a small piece of dialogue revealed from the finale episode may indicate that the Doctor meets a Clara that doesn't know him. Could the Doctor have wiped her memory and left her on Earth to protect her?
Only time will tell if my theories are correct, but I'm fairly certain I'm close to the mark. If all this foreshadowing is simply pointing to Clara's death, I have to say I'll be disappointed. Making everyone think Clara is about to meet her doom, then springing a different ending on them would be a marvelous bit of trickery.
Anywho, those are my theories for the Series Arc. Feel free to ask any questions you may have, point out holes in my reasoning, or remind me of clues I may have forgotten!
