Transmitted originally: 31 January to 14 March 1970.
The Doctor strives for peace between the humans and reptiles, gaining the trust of the old Silurian leader. However, a rebellious young Silurian seizes control and releases a deadly virus that threatens to wipe out humanity. The Doctor finds an antidote, but the Silurians retaliate by taking over the research centre and prepare to destroy the Van Allen Velt, a natural barrier shielding the Earth from solar radiation which would be harmful to mankind. The creatures are tricked into returning to the caves when the Doctor overloads the reactor, threatening to cause a nuclear explosion. The Brigadier then blows up the Silurian base, much to the Doctor's disgust.
The Doctor's yellow vintage car, nicknamed Bessie, appears for the first time in this story.
This is the only instance in the series' history of an on-air story beginning 'Doctor Who and...'
Actor Fulton Mackay, now better known as Mr Mackay in the classic BBC sitcom 'Porridge' appears as Dr. Quinn in the story.
OTHER FORMATS:
The Third Doctor Novelisations
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