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The Doctor and Rose land on a Human base that's stuck on a planet caught in orbit around a black hole. As soon as they arrive, a tremor occurs and the storage section
in which the TARDIS had landed disappeared down a large gap in the surface leaving them stranded.
The Humans are drilling deep into the planet's surface to find a very powerful power source with the help of the Ood - a telepathically linked race of slaves. Events
begin to turn sour, however, when Toby, the mission Archaeologist gets possessed by some unknown force. Soon afterwards one of the crew is killed as he destroys a section
of the base.
Once drilling is complete, the Doctor accompanies Ida (the chief scientist) down to the site of the power source where they find a large circular object, which begins to
open as Satan transfers itself into the Ood, who begin to advance...
Jefferson opens fire on the Ood as Danny runs out to join them. Captain Zachary, meanwhile, is trapped in the control centre. The lights go out and 'The Beast' announces its
intention to kill everyone on the Sanctuary base. The Doctor and Ida are about to return when the cable holding the lift snaps, leaving them trapped ten miles below.
As the Ood break down the door, Rose, Jefferson, Toby and Danny dive into the service tunnels and head for Ood habitation in an attempt to stop them. The Doctor decides to
head down into the pit to confront whatever is down there.
After the Ood are paralysed, Captain Zach joins the other survivors and decides to evacuate the planet. He says sorry to the trapped Ida as they blast off in the Rocket.
Little do they know that they have an unwanted passenger aboard...
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