Series: 2

Original Air date: June 10, 2006

Number Doctor: 10th

Companion(s): Rose

Writer(s):   Matt Jones

Director(s):  James Strong

Guest Stars
Danny Webb as John Maynard Jefferson
Shaun Parkes as Zachary Cross Flane
Claire Rushbrook as Ida Scott
Will Thorp as Toby Zed
Ronny Jhutti as Danny Bartock
Paul Kasey as The Ood
Gabriel Woolf as Voice of the Beast
Silas Carson as Voice of the Ood

Synopsis: The supposedly servile Ood are now in the control of some type of beast that describes itself as Satan and claims to be a being that has existed since before the creation of the known universe. Rose takes charge and tries to find a way to get everyone out safely. The Doctor and Ida have descended 10 miles into the bowels of the planet only to find themselves trapped there and unable to return to the surface. They find evidence of a ancient civilization and a seemingly bottomless pit where the doctor confronts the beast and finds the solution. The only problem is that the solution may kill Rose.

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