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.
The Doctor
Liz Shaw
Brigadier Lethbridge-Stewart
Dr. Quinn
Major Baker
Dr. Lawrence
Miss Dawson
Spencer
Masters
Dr. Meredith
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