This review contains plot spoilers.

Every now and again, an episode of Doctor Who comes along that divides and conquers at the same time. Kill the Moon could be that episode. It subverts expectations, and not just those of the viewer - nobody in this story gets what they expected either.

The episode begins with a quick scene-setting moment of Clara and 'disruptive influence' Courtney Woods on the Moon in the year 2049, broadcasting a message - they have a terrible decision to make. We then flash back to the present day at Coal Hill School, where Clara is giving the Doctor a piece of her mind for taking Courtney for a spin in the TARDIS at the end of The Caretaker, then telling her (off-screen) that she's "nothing special". Suddenly faced with an unhappy companion and a clearly distressed teenager, the Doctor makes the snap decision to take Courtney to the moon to try and make up for it, with Clara still on board. They arrive, not on the Moon, but on a dilapidated space shuttle heading very rapidly for it. A space shuttle full of nuclear bombs.

They are confronted by Captain Lundvik (Hermione Norris), and her two crewmates Duke (Tony Osoba) and Henry (Phil Nice). Lundvik's crew are on a desperate mission. The Moon has put on weight, and the Earth is being crushed under the pressure. Humanity is at the brink of extinction. Space travel at this point is in the doldrums, the last mission to investigate was ten years previously, and the Mexican crew disappeared without trace. Lundvik's crew have liberated a shuttle from a museum and are there to destroy the Moon. Norris is good as Lundvik, who comes across as cold and calculating, but in reality is a desperate, numbed woman on a suicide mission. Her cohorts, sadly don't get much to say or do. If this was Star Trek, they'd be wearing red shirts.

The Doctor is instantly on the case, noting that there is gravity where there should be none, and that the Moon is breaking up already. They investigate the base set up by the Mexicans, only to find it deserted except for cobwebbed and space-suited corpses. New Director Paul Wilmshurst wastes no time with the scares - there's something hiding in the shadows of the moodily-lit base, and in craters, some rather nasty spider-like creatures that make short work of Lundvik's crewmates. There's a brilliantly tense scene where the Doctor and co. attempt to escape a 'spider', and Courtney is trapped on the ceiling of a room with one when the gravity fails. The Doctor of course gets her back on the ground, and Courtney herself deals with the creature, but this is when the story starts to change from a straight scare-fest into a very different beast, from Philip Hinchcliffe scares to Malcolm Hulke moral grey areas.

It's all getting a little too real for the clearly scared Courtney, who asks to go home. The Doctor doesn't put up much of a fight, but locks her in the safety of the TARDIS while he continues his investigation. Ellis George is very good as Courtney. A whole episode of a teenager snarking in this scenario would be annoying and unrealistic - she shows that she's scared and cares enough about the situation to want to help, but even in the face of armageddon the shields are up, and she prefers to call Clara 'Miss'.

Paul Wilmshurst's direction is exemplary. He makes stunning use of the Lanzarote location as the lunar surface, and will doubtless traumatise a fair few youngsters with those vicious, screaming spiders. More from him please. New writer Peter Harness is also a real find, deftly handling scary and weighty with enough room for a joke about tumblr which other writers may have made into purest driven cheese.

The spiders are actually a form of bacteria, and the Doctor soon realises that the Moon isn't just a pile of rock orbiting the Earth. It's an egg, an egg with a very long gestation period - and it's hatching. A unique baby is about to be born.

Lundvik still wants to know how to kill it. Humanity is still at risk. Clara and Courtney insist that it's wrong to kill a baby. Clara turns to the Doctor to make a decision. And he walks away, disgusted with Lundvik who has primed the bombs, but adamant that this isn't his decision to make, snapping that it's time to take the stabilisers off the bike, and leaving the three women forty-five minutes to make a decision. Doctor Who is tackling abortion, and the Doctor has abdicated his responsibilities.

Clara puts it to the public vote. Humanity predictably chooses itself, but at the last moment she hits the abort button, and the Doctor reappears and whisks them back to Earth, where they witness the creature's birth from afar. You don't quite get a good look at it, which leaves something to the imagination. It lays a new egg to replace the old one before it flies away in peace.

Wrap up time.The Doctor makes a stirring speech about today being a turning point for humanity. Lundvik thanks Clara for stopping her from destroying an innocent life. Courtney heads for double Geography in the knowledge that she was the first woman on the Moon. All's well that ends well. Except when it doesn't.

Clara has been fairly subdued throughout, but is furious with the Doctor for leaving her with such a huge decision that she could so easily have got wrong. He gently tries to convince her that he knew she would always make the right decision, but it doesn't wash with her. He's patronised her and scared her out of her wits, and she makes a good point - he walks our world and breathes our air, so when we need him he bloody well needs to be there for us. The exchange ends with Clara telling the Doctor to go away and stay away.

Capaldi and Coleman are both excellent. The Doctor is still blunt, rude, and difficult, but he shows a slightly softer side towards Courtney and shows no hesitation in rescuing her, and a certain manic glee as he rushes around investigating. Likewise, he's warmer than usual towards Clara and clearly trusts her to make the right choice based on her character and his bluffing about history, despite how it backfires for him. The fangs are out however, when he makes his comment about the bike stabilisers. This Doctor feels he was in the right to step back and let history decide itself, and feels vindicated when the creature swoops off and the crisis is over. It's a bold choice to let the Doctor do this, clearly the 'Am I a good man?' arc is heading somewhere. How much of this he'll take on board is anyone's guess, but I'd imagine his mind will be well and truly made up by episode twelve.

Coleman, meanwhile, is notably less bubbly than usual for the bulk of the story, but is startling at the end. We've seen a tearful Tegan Jovanka say that it's not fun anymore, and a brave-but-upset Martha Jones leave the TARDIS to be there for her traumatised family - but Clara's scathing fury at the Doctor is something new. Leaving was never like this before. And it really feels like goodbye.

A brief coda follows, with Clara pouring her heart out to Danny, who tells her that if she was really done with the Doctor, she wouldn't be so angry. This feels tacked-on, doubtless to give a note of hope that Clara will reconcile with the Doctor, (of course she will) and to give a little hint to the continuing mystery of Mr Pink's army days - but personally I feel this takes away from the brilliant scene that precedes it.

Anyway, this quibble aside, this is an excellent, thought-provoking, and very grown-up piece of Doctor Who. It's not a comfy ride - and it's sure to prove divisive from its themes and the Doctor's vanishing act, but it's fair to say the stabilisers are off for this one.

Before we get to Peter Capaldi’s seventh episode as the Doctor, Kill the Moon, halfway through the season would seem a good time to see what we’ve learnt about the Doctor. Not surprisingly, nothing is cut-and-dried. If anything, every episode thus far has shown a different side to the Doctor, and a different mood, not all of them pleasant. In fact, they’re mostly bad moods, but that’s not necessarily a negative thing. Let’s have a look at the first six episodes, and the moods the Doctor displays.

Deep Breath: Angry Doctor
In his first story, the Doctor is angry for a number of reasons: he’s just regenerated, he’s confused, and he’s not happy with an older face – especially those eyebrows (but he quite likes the new accent). He’s experienced some memory loss, he’s not sure how to relate to people, most importantly Clara, but by the end of the episode, he’s calmed down enough to know he needs Clara’s friendship – and he asks her for it too, with a little help from his previous self’s phone call.

Into the Dalek: Cold Doctor
While the Doctor finds the thought of a good Dalek confronting and challenging, his focus on the mission to go inside Rusty and ‘fix’ it is very tight, and he can’t spend time showing compassion or grief when Ross is killed by the Dalek antibodies. He’s removed, emotionally distant, and even he isn’t sure if he’s a good man. It’s all a mask, of course, to protect him, in the same way his previous selves used bravado and gleeful excitement as masks, but not as endearing.

Robot of Sherwood: Grumpy Doctor
This less-than-endearing Doctor continues here. He’s disappointed that Clara wants to meet a legend rather than a real historical figure, and he’s irritated by Robin Hood, his merry men and their laughter and banter – maybe it reminds him of his previous selves’ modus operandi. And he’s annoyed that he’s proved wrong about Robin Hood. But then at the end, he drops the pretence, and we see the unwilling hero behind the mask.

Listen: Scared Doctor
The mask drops further here. There is something under the bed, it scares the Doctor because he doesn’t know what it is, and he doesn’t like that. So he sets out to find out what it is. Rather than putting himself on the line, he uses Clara to explore this universal dream. Thanks to her distraction though, it’s Danny Pink who’s the unwitting subject, until Clara is taken to the Doctor’s own childhood and his own fears.

Time Heist: Driven Doctor
In the same way the Doctor did in the Dalek mission, he takes control of the bank heist and assumes command, seemingly unconcerned by the other team members’ feelings. He’s not sure who the Architect is, and why they’re breaking into the bank, but he knows they’ll only find out by completing the impossible mission at any cost. Luckily the actual cost isn’t that dire – something that he himself set up, and once again, showing that under his brittle exterior two very compassionate hearts still beat.

The Caretaker: Jealous Doctor
While he goes undercover at Coal Hill Secondary School, ostensibly to see k out the deadly Skovox Blitzer, the Doctor is secretly investigating Clara’s private life, specifically her ‘boyfriend’. And he gets that wrong too. He knows, despite the feelings he still has (and can’t quite express) for Clara, regardless of his regeneration, he’s not her boyfriend, and won’t ever be. But he still wants her to be happy. That’s why he looks at Adrian and sees something of his previous self, and assumes that this is Clara’s love interest. He’s not happy when he discovers Danny is her actual boyfriend, and he’s jealous. Because he doesn’t like military men and takes an immediate dislike to Danny, and because he believes Danny’s not good enough for Clara – something that Danny challenges him on.

The Impossible Girl
But enough about the Doctor. Let’s talk about Clara. What does she think of the Doctor? Because she really is the voice of the audience, whether they are hardcore fans or just casual viewers. In Deep Breath, not only do we see her struggling to accept this new/old face of her friend, but it’s addressed overtly, specifically in the conversation she has with Madame Vastra about veils and perceptions. In subsequent episodes it’s obvious that she still enjoys travelling with the Doctor – with reservations – but she’s not yet ready to let Danny in on the secret, at least until she is forced to in The Caretaker. She is, like the audience, slowly getting used to this new Doctor and his moods. She may not like everything he says or does, but she remains faithful to him and is willing to give him a go. And that too is made obvious in Time Heist, when Psi notes how often she excuses his bad behaviour. And with Danny in the picture now, we’re seeing a more complex Clara. She’s not just the perky cheeky Impossible Girl – she too has her secrets and faults.

In the Pink
As for Danny Pink, he’s a character that’s developing quite nicely. Cast from the same mould as Mickey and even Rory, but with more baggage and backstory, it didn’t take him long to work out the Doctor, and seeing that develop will be quite the treat. So bring on the next six episodes and let’s see what else we learn about the Doctor, Clara, Danny – oh, and Missy too…

If The Mega had been made in 1971, it could have been a classic season finale. There are so many strong Pertwee-era ingredients that it feels perfectly at home in Season Eight, the only thing missing is the presence of the Master. Here, it's lovingly nursed from a storyline by The Web Planet writer Bill Strutton by Simon Guerrier, and performed by Katy Manning and Richard Franklin.

The Mega deals with an attempt to force the West to disarm and put an end to war by Prince Cassie of the fictional nation Golbostan, backed by the alien Mega - beings of pure energy. The story begins with the Doctor, Jo, and Captain Yates heading through a sea of protesting youngsters to a demonstration of a horrific new weapon - a nerve gas which can choose its victims. A regular army General comments that the gas can be used on the protestors, much to the Doctor's outrage - at which point the General is assassinated by the Mega, and things begin to unravel. The Doctor and Jo are led to Cassie's castle in Golbostan by the Mega, whilst things get worse - the Prime Minister is the next target, live on TV, the Brigadier is placed under arrest, and Yates and Benton try to keep order when panic-stricken rioting breaks out amongst the public.

The story resonates with both period and modern concerns about war, protest, and the use of WMDs, and given Malcolm Hulke-like moral shades of grey. The whole conceit of the nerve gas that can pick its victims by their genetic make-up is very similar to the chilling Janus virus in Channel 4's recent Utopia. The murky concept of 'the greater good' also comes up, despite things having descended by episode six into borderline armageddon. In an echo of his apparent treachery in The Claws of Axos, the Doctor at one point seems to side with Cassie and the Mega's plot, and indeed is seen as a traitor by the top brass at home. He has to appear to co-operate to an extent to save lives - including Jo's, and is every bit the clever, resourceful, and flamboyant Third Doctor we remember - bursting with moral outrage.

The whole tale is carried beautifully by Katy Manning and Richard Franklin, with Derek Carlyle and Bo Poraj in supporting roles, and directed by Ken Bentley. Manning in particular deserves props for not only her note-perfect performance as Jo Grant, but managing to evoke Jon Pertwee in the lines she reads for the Doctor. It's not perfect, but it's a testament to her considerable skill with voices. Franklin plays basically all of UNIT. His own performance as Yates is as good as ever, and his Brigadier in places evokes Nicholas Courtney very well. As for Benton, he doesn't have so much to do - but Franklin leans perhaps a bit too hard on John Levene's West Country accent and makes him sound like he's auditioning for The Wurzels.

Nonetheless, this is an excellent story, and well worth three hours of your time.

Both a prequel and a sequel to 1977’s Fourth Doctor story, The Invisible Enemy, the latest adventure for the Seventh Doctor (Sylvester McCoy) and Ace (Sophie Aldred) picks up where 2013’s Afterlife left off. Hex (Philip Olivier), now known as Hector, and in possession of an entirely new set of memories, has re-joined the TARDIS crew, and his relationship with Ace has grown more intimate. Unfortunately, his condition has also left him psychically vulnerable: in the opening minutes of the adventure Hector is infected by The Swarm – a telepathic virus with delusions of grandeur that has lain in wait inside the TARDIS for centuries, having previously been defeated by the Fourth Doctor and Leela.

What follows is a solid but somewhat by-the-numbers story involving return visits to two prominent locations from The Invisible Enemy: Titan Base and the Bi-Al Foundation (aka the Centre for Alien Biomorphology), though at different time periods from the original television story. And just as part three of The Invisible Enemy ventured into a new, albeit derivative location, so too does part three of Revenge of the Swarm. Instead of Bob Baker and Dave Martin’s pastiche of the Sixties SF film Fantastic Voyage, however, writer and stand-in script editor Jonathan Morris references a more recent film, 1982’s Tron, in this audio adventure.

Major scenes in parts three and four of Revenge of the Swarm take place inside the Hypernet: a galaxy-connecting virtual world whose visual representation doesn’t seem to have much evolved beyond William Gibson’s 1984 novel Neuromancer, in which Gibson described cyberspace as: “A graphic representation of data abstracted from the banks of every computer in the human system. Unthinkable complexity. Lines of light ranged in the nonspace of the mind, clusters and constellations of data. Like city lights, receding.” In Revenge of the Swarm, Morris similarly and somewhat unimaginatively describes the Hypernet through the mouths of Ace and the Doctor as resembling “glowing green lines of numbers in the sky … square buildings and skyscrapers but as outlines… symbolic representations of blocks of memory”.

Morris’ predictable depiction of the Hypernet extends to his plotting as a whole; his attempt to echo the plot beats of The Invisible Enemy results in a story that is serviceable, but rarely exciting; and its appropriation of Eighties’ cultural touchstones such as Tron lack the inventive flourishes that made similar pastiches during the Holmes-Hinchcliffe years so memorable.

Performances too are sometimes lacking, particularly Olivier, who comes across as unnecessarily leaden, almost somnambulistic in the scenes where he is possessed by the Swarm (especially in comparison to Michael Sheard’s vibrant performance as a similarly-possessed Supervisor Lowe in The Invisible Enemy); even McCoy seems a little bored, rolling his R’s constantly as if trying to bring some life to the script. Thankfully John Leeson, returning after 37 years as the Nucleus of the Swarm, brings some much-needed flair to the production. Supporting characters are consistently well presented, especially Phyllida Nash as Professor Oksana Kilbraken, whose invention of a particular cloning technique plays a key role in both The Invisible Enemy and the first two episodes of this new adventure.

Given that Revenge of the Swarm is the first real adventure for this new version of Hex following his introduction in Afterlife, it’s also surprising that the story is one in which he is immediately possessed, a scenario which denies both Morris as writer, and Olivier as performer, the chance to explore more of what makes Hector unique. Nor does this plot device provide the opportunity to flesh out the changed dynamics between Hector, Ace and the Doctor. It remains to be seen whether Hector’s new personality and its ramifications for a TARDIS crew who’ve been traveling together for a decade will be more successfully explored in future audio adventures.

Another problematic aspect of the script highlights issues that current Big Finish writers face with Ace: her cultural touchstones suddenly include films outside her era, such as 1999’s The Matrix, suggesting her character has evolved in the years since Ace was last seen on television. This impression is later contradicted by her curious naiveté concerning the story’s technology (“What exactly does a neural interface helmet do,” she asks in episode three, as if its self-explanatory name would not be obvious to someone who’s travelled with the Doctor as long as Ace has) and especially by her unwavering loyalty to the Doctor, when she tells Hector in the final scenes of Revenge of the Swarm that: “The Doctor’s right; he’s always come through in the end, without fail.” Fans know that McCoy’s manipulative Seventh Doctor has let Ace down before; a conundrum that’s difficult to reconcile with earlier impressions that she’s grown as a character since 1989’s Survival.

On a positive note, the dynamic between Aldred and McCoy is as strong as ever; a scene in which Ace tells the Doctor, as he prepares to enter the Hypernet, that “You don’t think I’m letting you go in there on your own?” has the perfect mix of exasperation and camaraderie; a simple but charmingly effective summation of the well-established bond between these two iconic characters.

The Invisible Enemy memorably introduced a now much-loved new companion to Doctor Who in the form of K9, as well as heralding what was to become a progressively lighter tone to the series in subsequent seasons. It’s unlikely that this by-the-numbers Big Finish adventure will prove to be as significant, in hindsight, in another 37 years’ time.

The Brood of Erys packs a classic Doctor Who premise – arriving in a star system containing just a single planet and its accompanying moon, as well as an array of radio beacons lining its boundaries, the TARDIS intercepts a mysterious transmission informing its crew that their lives will be in jeopardy should they venture any further. Naturally, the Doctor and Flip (Lisa Greenwood) travel into the metaphorical heart of the danger zone, only to find themselves and their vessel latched onto by a family of “curious” extraterrestrial beings called the Drachee (think the Slitheen, but with subtler and less frequent expressions of gaseous exchange and, mercifully, far less slapstick humour).

There’s something charmingly innocent about the concept of a horde of alien toddlers exploring the deepest recesses of the TARDIS in order to simply learn more of the unknown (not least due to the high-pitched voice of their leader) – and something inherently hilarious about the characteristically melodramatic and agitated reaction offered by Colin Baker’s incarnation of the Doctor – yet as is virtually always the case in narratives taking place within the so-called Whoniverse, the situation turns sour in a matter of moments. Flip is taken hostage by those same individuals who claimed themselves to pose “no danger” whatsoever, while her self-appointed protector is forced to take refuge on a damaged space yacht – and, soon enough, the planet Asphya itself – with an amnesia-prone female humanoid who can’t remember her own name, let alone her dark history or the influence it’ll have on events to come.

In spite of the commendable sense of scale conveyed by these initial eventful set-pieces, Brood’s narrative comes to focus far more on psychological demons than it does physical antagonists, a rare attribute which previously worked to great effect in televised serials such as 42 and Midnight and which certainly doesn’t do the story any harm in terms of building the intrigue surrounding its constructs and the somehow-sentient moon of Erys. Central to writer Andrew Smith’s prolonged investigation of the inner workings of the mind is this notion of an intelligent planetoid and the ramifications its sudden (or gradual) metamorphosis could have for its inhabitants. Of course, as plot elements go, a sentient moon is by no means a completely original addition to the series’ lore (although one might argue that nearly fifty-one years on from November 23rd, 1963, it’s nigh-on impossible for today’s scribes to give birth to wholly unique antagonists) – The Doctor’s Wife’s House comes to mind as a recent example of how such a conceit can be implemented efficiently within the realms of modern science-fiction (and, indeed, modern Who) – so it’s a great relief to see Smith take such a contrasting approach to his predecessors, intertwining the arcs of the aforementioned amnesiac, the Drachee (who offer up an all manner of simultaneously humorous and quasi-philosophical insights into the current predicament facing Erys and the system as a whole) and the spherical landmass which gives this particular audio drama its name to such an extent that one can’t fail to be swept up by the mystery surrounding both of them.

That said, while Smith undoubtedly manages to subvert expectations of the traditional representation of adversaries who attack via the mind rather than through any physical manifestation, Brian Shelley’s voice work as the mental embodiment of Erys isn’t quite so successful in this regard. Sure, there’s genuine enthusiasm and vigour present in Shelley’s portrayal of one of the more abstract (and therefore challenging) forces conceived by the minds of Big Finish in recent years, but when it’s juxtaposed with Michael Sheen’s chilling vocal contribution to Neil Gaiman’s aforementioned 2011 TV story, it’s all but pointless to attempt to argue that the former performance is anywhere near as memorable or layered – instead, it comes off as rather derivative, as if Shelley has dedicated a considerable amount of his spare time to watching psychologically investigative serials like The Brain of Morbius in order to hone his contribution to the ever-expanding world of Doctor Who spin-offs (if such a term can even begin to do justice to the increasingly accomplished and ambitious work of Big Finish and its various writing teams) rather than focusing on putting his own engaging spin on the dialogue afforded to him in the notably generous script (that several scenes rely wholly on his ability to match and / or surpass Lisa Greenwood’s evident enduring passion and conviction doesn’t help matters either).

If Shelley is the play’s weakest link, then Baker and Greenwood are easily the two central components which (in tandem with the near-unparalleled intelligence of Smith’s delicately-structured and thematically subversive storyline) hold it all together. Both of these talented thespians have had more than enough time to develop their portrayals and to tailor them to cater for the preferences of Big Finish’s constantly expanding Doctor Who-orientated fandom and, unsurprisingly, they’ve done so with enviable ease, to the extent that they’re now seemingly able to transform even the most exposition-centric sequences into dramatically engaging exchanges that reward the attentive listener in unexpected ways regardless of whether or not they feed directly into the narrative’s denouement. The sixth Doctor in particular is taken completely and utterly out of his comfort zone as the situation at hand shifts out of his control and unseen forces manipulate proceedings in order to suit their own ends, instantly enabling Baker to flex his performing muscles as his character’s increasingly desperate attempts to rally against his newfound nemeses begin to seem more and more futile.

After months upon months of mediocrity, then, Big Finish’s Doctor Who audio dramas may well have found their footing once again with The Brood of Erys. Andrew Smith – unlike several of his esteemed predecessors - doesn’t rely on the series’ past tropes in order to strengthen the credibility of his tale, nor does he integrate needlessly contrived references to classic or modern serials in a similar vein to those scribes who fear that they’ll lose their listeners’ attention should they neglect to include such call-backs in the mix. There’s still room to improve in future sixth Doctor productions, of course – perhaps it’d be worth Smith becoming more involved with the casting process when it comes to selecting a truly accomplished voice actor to portray his next storyline’s central antagonist, since Brood’s brilliantly subversive script certainly more than warranted such talent – but to paraphrase John Hurt’s already-beloved War Doctor, for now, for this moment, this is the show we’ve come to know and love again.

Clara Oswald had been doing a good job of leading a triple life lately, but something had to give.
She was already a teacher of unruly teenagers at Coal Hill, and assistant/carer/conscience to a newly unpredictable Time Lord to start with. As if those two factors weren't enough to contend with, now she's in a new relationship too, with Danny Pink. She's struggling to keep them separate, as she careers breathlessly between adventures and dates. She's eating two dinners in a row, going for a run after running down corridors, fishing seaweed from her hair. She's flagging. The control freak in her is working overtime trying to keep her worlds from overlapping. She seems slightly uncomfortable that the kids all know about her and Danny. She really doesn't want the Doctor and Danny even knowing about each other. So, when a very familiar looking relief Caretaker shows up in the Coal Hill staff room, she's appalled, and Danny instantly suspects that Clara already knows this man...

The Doctor is being proactive again, and has decided to go 'deep cover' to sniff out the threat. His version of deep cover is to basically put on an overcoat. His latest incarnation can't be bothered to try and fit in with the natives, particularly the P.E. Teachers. He makes angry signs, disrupts lessons, and even breezily shows pupil-with-attitude Courtney the TARDIS interior. Imagine if this incarnation had been the one exiled to Earth, he would have gone stir crazy. The Brigadier would probably have had him locked up next to the Master.

The threat is the deadly robotic Skovox Blitzer, drawn to the area by decades-worth of artron energy. It's a curious thing, another lone-gunman, a diminutive metallic soldier awaiting orders - scurrying around like a toy Racnoss. It's certainly very good at blowing things up - and people, like that poor Policeman, who meets a grisly end.

It's not a great villain, and although the design is novel, it's hard to believe that this critter could really take out the entire world. This series is getting quite robot-heavy. That said, this story isn't about the Skovox Blitzer. It's about the Doctor and Danny's relationships with Clara, and how they meet and reluctantly reach a grudging respect for each other, despite this Doctor's pronounced dislike of soldiers, a theme that has been prominent in this series, and looks to continue. 

The Doctor and Danny predictably clash, it's an interesting clash too, as normally when presented with a boyfriend figure it's not so much of a fair fight. Danny, being more of an alpha male, gives as good as he gets. Clara, meanwhile, doesn't end up having to choose between the men in her life, but does blurt out that she loves Danny. This, and Danny's inevitable role in the resolution help his case with the Doctor, who wants to know she's with someone good enough for her. Danny, meanwhile, wants to know Clara is safe. Although all three are at peace at the end of the episode, there's clearly something building, and we're probably due some turbulence and heartbreak soon.

Capaldi, Coleman, and Anderson are all excellent in this. Capaldi gets some zingers from Gareth Roberts and Steven Moffat's very funny script, and also the chance to run the gamut from boredom, rage, and a knowing little moment of vanity when he mistakes another teacher for Clara's boyfriend. His Doctor also gets to bond with the equally bolshy Courtney, who's back next week for a trip to the Moon, where bad things are likely to happen. Jenna Coleman gets better and better every episode, Clara continues to come into her own, and her chemistry with Capaldi is a joy to watch. She's equally good in a quieter way with Anderson, who continues to knock it out of the park with a subtle, well-judged performance.

The only criticism? More threat next time please. Although, looking at the teaser for next week, there's unlikely to be a shortage of that. See you on the Moon.