“The Impossible Planet” places the Doctor and Rose on Sanctuary Base 6, a research station orbiting a planet impossibly stable beside a black hole. An ancient presence begins possessing crew members and the servant species the Ood, claiming to predate the universe itself, while the Doctor finds himself without answers or an escape route.
The episode is praised for its sustained, patient horror, strong ensemble crew, and a quieter emotional thread in which the loss of the TARDIS forces the Doctor and Rose to contemplate an ordinary life together. It ends on an unresolved cliffhanger as a sealed pit opens at the planet’s core.
Sometimes Doctor Who wants to make you laugh, and sometimes it wants to scare the living daylights out of you. “The Impossible Planet” is firmly in the second camp — a slow, dread-soaked descent into the best kind of sci-fi horror, all clanging metal corridors and whispering shadows and a fear that gets right under the skin. After the retro fun of The Idiot’s Lantern, this is the show reaching for Alien and Event Horizon, and reaching them. It’s the first half of a two-parter, and by the time the cliffhanger hit I was genuinely rattled.
The Impossible Planet
The TARDIS materialises on Sanctuary Base 6, a cramped, functional research station bolted onto the surface of a planet that has no business existing. The world of Krop Tor sits in perfect, stable orbit around a black hole — a thing that should be physically impossible, since anything that close ought to have been ripped apart and swallowed long ago. Yet here it hangs, held in place by some vast unknown power source buried at its core, and a human expedition has come all this way to drill down and find out what’s generating it. The Doctor, reading the situation, is almost giddy with terror and wonder in equal measure: this shouldn’t be here, and he loves it, and it frightens him.
The visual of it is stunning. When the base’s great shutters roll back to reveal the black hole filling the entire sky — a churning maw of doomed, in-falling light — the show simply lets the crew, and us, stand and gape at it. It’s one of the most genuinely awe-inspiring images the series has managed on a BBC budget, and it doubles as a ticking clock: everything about this station is precarious, held together by bolts and back-up systems and luck, and you sense from the very first minute that it is not going to hold.
The base crew are one of the show’s better ensembles — Captain Zachary Cross Flane, the steady science officer Ida Scott, the jittery archaeologist Toby, ethics officer Danny, gruff security man Jefferson, and young Scooti. They’re ordinary working people a very long way from home, and the episode takes real care to make them feel lived-in before it starts putting them in danger. Serving them are the Ood, a new alien species — softly spoken, tentacle-faced telepaths who carry glowing translator orbs and exist, a little uncomfortably, to serve. “We must serve, we have nothing else in life,” one says, and the Doctor’s flicker of unease at that is well judged.
He Is Awake
Then the whispering starts. The Ood begin relaying messages that aren’t theirs: “He is awake.” “The Beast and his Legions shall rise from the Pit.” Something buried in the heart of this impossible world is stirring, and it is old — older, it claims, than the universe itself. It reaches into the mind of poor Toby first, scrawling ancient symbols across his skin and burning his eyes a hellish red, and it turns the placid Ood into a telepathic weapon, their translator readings climbing toward “the point of death.”
Director James Strong wrings every drop of tension out of the setup. The Beast’s messages arrive in fragments, half-heard over crackling comms, so you’re always leaning in and always a beat behind. It doesn’t announce itself with a big monster reveal; it seeps into the base through the people, one mind at a time, so that any face on the station might already belong to it. That creeping uncertainty — who’s still themselves, and who isn’t? — is far more frightening than anything with teeth.
What makes it work is how completely the episode commits to the horror. This isn’t a monster you can technobabble your way around; it’s a presence, an intelligence claiming to be the Devil himself, the thing every culture’s demon myth is a memory of. The Doctor — a man who prides himself on having an explanation for everything — is visibly wrong-footed, and Tennant plays that beautifully. When the possessed Toby’s power lashes out and young Scooti is lured to her death, sucked out through a cracked viewport into the void, the show makes it clear the stakes here are total. Nobody is safe, and the Doctor doesn’t have his usual head start.
No Way Home
And then it does the cruellest thing of all: it takes the TARDIS. A quake tears open the base, and the Ship tumbles down into a collapsed shaft, lost somewhere in the depths of a dying planet on the edge of a black hole. For once, there’s no easy way out — no dematerialise-and-flee. The Doctor has to sit with the possibility that he and Rose are simply stuck here, for good.
The scene that follows is my favourite in the episode, and it has nothing to do with monsters. The Doctor and Rose, marooned and scared, quietly talk about what a life without the TARDIS would even look like — getting a house, a mortgage, “the domestic approach,” the two of them just… living, somewhere, together. It’s tender and awkward and enormously revealing about where these two have ended up with each other, a world away from the giddy tourists who lay in the apple grass back in New Earth. The show doesn’t spell out what they are to one another. It doesn’t have to.
There’s a nice thread of continuity for eagle-eyed fans, too: this deep-future expedition is operating under the banner of the Torchwood Archive — the name Queen Victoria coined back in Tooth and Claw, turning up thousands of years later at the far end of space. Doctor Who is clearly building something with that word, and it’s fun to watch it surface where you least expect it.
With the drilling complete, the Doctor and Ida descend in a capsule to the planet’s core, to the source of the impossible power. The drop down the shaft is pure horror-movie grammar — the rattling little pod, the fathomless dark, their torch beams swallowed whole by a cavern far too vast to light. At the bottom they find an enormous sealed trapdoor, an ancient disc-shaped lid over a pit with no mechanism and no way in — and then, against every instinct screaming at them to leave it well alone, it grinds open of its own accord, revealing a shaft that plunges down toward the literal heart of the world. Some doors, you sense, were never meant to be opened.
What The Impossible Planet Leaves Us With
A masterclass in mounting dread that sets its trap with real patience. Here’s what it plants:
- Genuine, grown-up horror. Isolated base, dwindling crew, an ancient evil in the dark — the show hasn’t been this frightening in a long time, and it never blinks.
- A Doctor out of his depth. Faced with something that claims to predate creation, the man with an answer for everything has no answer, and his fear is the scariest thing in the episode.
- The Ood arrive. A new servant species whose forced servility the episode quietly refuses to let us feel comfortable about — and who make for deeply unnerving villains once the Beast gets hold of them.
- The Doctor and Rose, laid bare. Stripped of the TARDIS, the two of them contemplate an ordinary life together, and it’s the most honest their relationship has ever looked.
- That word again. The Torchwood Archive’s cameo keeps a season-long thread quietly ticking along at the edge of the frame.
Rating: 4.5/5 — Atmospheric, intelligent, and properly scary, with a stranded-Doctor angle that raises the stakes higher than any monster could. One of the best-directed hours the revived show has produced, and a superb first half.
The pit is open, the Ood have turned, Toby’s eyes are burning, and something enormous is rising up out of the dark toward the Doctor. That’s where they leave us. I’m not sure I’ve ever wanted next week to arrive faster.