The Doctor reasons with the Silurians

Tags: Third Doctor, Silurians, The Brigadier

The Silurians, episode 5
28 February 1970

Wenley Moor nuclear research facility keeps losing power. The cause lies in the cave complex deep below: the Silurians – long ago the dominant life-form on Earth – are waking up. And they want their planet back from the ape primitives…