Investigating mysterious power failures and a death at an underground research centre, The Doctor discovers a colony of Silurians - prehistoric, intelligent reptiles who went into hibernation before man evolved. But now they have woken up, and they are prepared to wipe out mankind with a killer plague to get their planet back.
Directed by Timothy Combe
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Cast
Jon Pertwee
The Doctor
Caroline John
Liz Shaw
Nicholas Courtney
Brigadier Lethbridge-Stewart
Fulton Mackay
Dr. Quinn
Norman Jones
Major Baker
Peter Miles
Dr. Lawrence
Thomasine Heiner
Miss Dawson
John Newman
Spencer
Geoffrey Palmer
Masters
Ian Cunningham
Dr. Meredith
Paul Darrow
Captain Hawkins
Roy Branigan
Roberts
Bill Matthews
Davis
Nancie Jackson
Doris Squire
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