Series: 5

Original Air date:  May 29, 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/Restac
Meera Syal as Nasreen Chaudhry
Robert Pugh as Tony Mack
Nia Roberts as Ambrose
Richard Hope as Malohkeh
Stephen Moore as Eldane
Alun Raglan as Mo
Samuel Davies as Elliot

Synopsis: The Doctor and Nasreen Chaudry go deep underground and find an ancient society that has been disturbed by the drilling. They are gassed and taken prisoner just as Amy manages to free herself. The military commander of the underground reptilians, Restac, is convinced that the “apes’ – their term for humans – are an invading force. Calmer heads prevail and the Doctor manages to negotiate a truce pending the transfer of prisoners which he, and some of the more pacifist members of the reptilians, hopes will lead to a lasting peace. The only problem is that Alaya, the reptile prisoner has been killed and Restac is ready to go to war.

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