Series: 5

Original Air date:  May 22, 2010

Number Doctor: 11th

Companion(s): Amy Pond and Rory Williams

Writer(s):   Chris Chibnall

Director(s):  Ashley Way

Guest Stars:
Neve McIntosh as Alaya
Meera Syal as Nasreen Chaudhry
Robert Pugh as Tony Mack
Nia Roberts as Ambrose
Alun Raglan as Mo
Samuel Davies as Elliot

Synopsis: The Doctor tries to get everyone to Rio, but nothing quite goes as planned. They arrive in a small Welsh village where the Doctor immediately senses that the ground isn’t quite right. There is a drilling rig nearby that has reached a depth of 21 kilometers when odd things begin to happen. A local village man has disappeared and soon after Amy is swallowed into the ground. The Doctor realizes that the drilling has disturbed an ancient reptilian race that has lived deep underground for thousands upon thousands of years and who are determined to protect themselves against the ‘apes’ who live on the surface.

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