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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.
Length 175 minutes
Jon Pertwee | Caroline John | Nicholas Courtney | Fulton Mackay | Norman Jones | Peter Miles | Thomasine Heiner | John Newman | Geoffrey Palmer