Doctor Who - Doctor Who and the Silurians (3)

Seizoen: 7 - Aflevering: 7 / 261 - Eerst uitgezonden: 14 februari 1970 - Episode ID: 75771

England, the near future. Wenley Moor research station is experiencing strange power losses, and off-duty staff have been killed while potholing in the local caves. What ancient force has the station reactor re-energised? And is Man's civilisation really the only one in Earth's history?