Doctor Who - Doctor Who and the Silurians (5)

Seizoen: 7 - Aflevering: 9 / 263 - Eerst uitgezonden: 28 februari 1970 - Episode ID: 75773

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?