Here's the BBC blurb: "Rose finds herself further away from home than ever before, on a desolate world in the orbit of a Black Hole, in the first episode of this two-part story. Trapped with an Earth expedition and the mysterious Ood, the time-travellers face an even greater danger as something ancient beneath the planet's surface begins to awake."

Trapped is right. The TARDIS is swallowed up by the planet when there is an Earthquake. Rose and the Doctor discuss settling down with a mortgage (though the Doctor said he'd prefer to die on the planet instead)

The premise is great. They land on a base that is being held in place by some unknown gravity field. The reason why it was so fascinating to the humans investigating it is because it is being held in place while entire solar systems are swallowed by a gigantic black hole above it.

The slaves of the humans, called the Ood, are empty, fairly mindless herd aliens that depend on serving others to fulfill a need. Sounds like they've been specially bred for gods...

After introductions and some rather shocking events (the Tardis goes missing) Toby gets possessed by 'something' There's a flash on the monitor that looks a bit like the Destroyer from Battlefield, or maybe it is Sutekh from Pyramids of Mars, but it quickly vanishes. Lots of hints that there's a creature trapped below.

The team are drilling to the zero point to find what kind of power is holding the planetoid away from the black hole. Eventually they break through and the Ood's normally Basic 5 empathy and telepathy level suddenly rises to 100. After Satan takes over Toby again it splits itself into all the Ood's on board. Bright red eyes abound as the crew are suddenly faced with murderous Ood, while the Doctor is trapped at the bottom of the shaft as something begins to awake. And, just like in Aliens of London, there's a third cliffhanger in that the force holding the planet in place is suddenly released and they start tumbling towards the black hole.

Did I say I loved this story? This story has every element that I like about a science fiction adventure. I really, really hope that the next part is as good. Atmosphere, great graphics, great effects, excellent scenarios, interesting situations, and a super alien that the Doctor would have a hard time fighting. And it would be cool if Satan turns out to be an Osiran! 10/10

David Tennant plays the Doctor, Billie Piper plays Rose and Will Thorp plays Toby.