The Impossible Planet (TV story)

"Don't look at me, one look and you will die."

- The Beast

Synopsis
The TARDIS lands in a base on Krop Tor, a planet which orbits the black hole K37 Gem 5 without falling into it, a circumstance so inexplicable that even the Doctor cannot understand it. The base crew are drilling to the centre of the planet, to discover the power source which keeps it in a stable orbit around the black hole. But an ancient evil is there too. And he is awake.

Plot
The TARDIS materialises inside a "Sanctuary Base" meant for deep-space expeditions. The Doctor and Rose discover an inscription scribbled on the station wall which the TARDIS is unable to translate.

After a slight misunderstanding when first meeting the Ood, a docile race of empathic servants who work on the station, the travelers meet the crew of the base, led by acting Captain Zachary Cross Flane. The crew, which includes Science Officer Ida Scott, Head of Security John Jefferson, and archeologist Toby Zed, are on an expedition on an anomalous planet in orbit around a black hole. The Doctor realises that it is impossible for the planet, which is called Krop Tor, to be in geostationary orbit around the black hole, as it should be pulled in like the star systems around it are. He calculates that it would take a phenomenal amount of power (Six to the power of six for six seconds) to generate the huge gravity funnel stabilising its orbit. The funnel is not a natural phenomenon, and the crew is drilling ten miles underground to the core of the planet in hopes of finding the power source and using it. The origin of the power source is an ancient civilisation that had been on Krop Tor, and the inscription on the wall is a transcription of a stone tablet found on the planet.

The Doctor soon discovers that storage sections 5 to 8 had collapsed as a result of the earthquake-like tremor they had experienced moments after their arrival, dropping the TARDIS, which had been in Storage 6, into a crevasse. With no resources to divert the drilling, Rose and the Doctor are stranded.

It isn't long before a malevolent presence begins to make itself known. Strange messages about the Beast awaking to make war against God emanate from the Ood's translation spheres and the base computer's speakers. Toby begins to hear voices just before he is possessed by the Beast.

The team finally manages to drill down to the core of the planet. The Doctor and Ida journey down the mine shaft and into a massive cavern with ancient giant sculptures along its walls. They head for the power source, guided by sensor readings, and find a large circular disk set in the floor of the cavern, which the Doctor suspects is a trap door of some sort. The edge of the disk is also covered with inscriptions.

Meanwhile in the base, the Ood's telepathic fields rise dangerously to Basic 100, which is high enough to induce brain death, but they are obviously still alive. Finally the beast makes itself known through Toby before seemingly transferring itself to the Ood. The Ood identify themselves as the Legion of the Beast and begin to advance on the crew members, including Rose. Finally, the Doctor and Ida stand before a seal on the cavern ground, which then slids open, to a black chasm. A voice booms out from beneath it, stating, "The pit is open, and I am free!"

Cast

 * The Doctor - David Tennant
 * Rose Tyler - Billie Piper
 * John Jefferson - Danny Webb
 * Zachary Cross Flane - Shaun Parkes
 * Ida Scott - Claire Rushbrook
 * Toby Zed - Will Thorp
 * Danny Bartock - Ronny Jhutti
 * Scooti Manista - MyAnna Buring
 * The Ood - Paul Kasey
 * Voice of the Beast - Gabriel Woolf
 * Voice of the Ood - Silas Carson
 * Female Guard - ?
 * Male Guard - ?

Crew
to be added

Story Notes

 * Gabriel Woolf previously played (and voiced) Sutekh in Pyramids of Mars.
 * The episode has a few references to the ID Software computer game DOOM; the door opening sounds are the same used in DOOM and DOOM 2.
 * The Doctor calculated that the power needed was six to the power of six every six seconds, a reference to 666, the supposed number of the devil.

Ratings

 * 6.31 million viewers

Myths
to be added

Filming Locations

 * Wenvoe Quarry, Cardiff
 * Mamhilad Park Industrial Estate, Pontypool, Wales
 * Unit Q2, Imperial Park, Imperial Way, Newport
 * HTV Wales Studios, Culvershouse Cross, Cardiff
 * Enfys Television Studios, Unit 31, Portmanmoor Road, East Moors, Cardiff
 * Pinewood Studios, Iver Heath, Buckinghamshire
 * Ealing Film Studios, Ealing Green, Ealing

Discontinuity, Plot Holes, Errors

 * Ida considers the concept of the planet having a name ludicrous. However, it is later stated that in the Scripture of the Veltino, the planet is named Krop Tor.She means that the planet does not have an official intergalactic designation.
 * It is just as possible for a planet to orbit a black hole as it is to orbit a star, as long as it is far enough away and moving fast enough.It is, however, unlikely. The planet may be closer than should be possible.
 * Rose jokes about the Ood's name, saying it is 'very Ood'. Given that the TARDIS translates languages, and the crew on Krop Tor presumably don't speak english, how can they understand the play on words? It's presumable that the crew do know English or if it isn't their first language, they know it anyway. This assumes the play on words itself cannot be translated.

Continuity

 * A similar devil like creature appears in TW: End of Days.
 * Rose mentions her experience as a dinner lady in DW: School Reunion.

International broadcast
When aired by the Canadian Broadcasting Corporation in late 2006, this episode was considered a mid-season cliffhanger, with The Satan Pit and the rest of the season not airing until early 2007, after a hiatus of several months. At the time the CBC made this decision a trend had developed among North American networks to insert lengthy (sometimes months-long) breaks during the November-January period.

DVD Releases

 * This was released on a vanilla DVD along side The Satan Pit and Love and Monsters.
 * It was also released as part of the Series 2 DVD box set.