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.

Jon Pertwee
as The Doctor

Caroline John
as Liz Shaw

Nicholas Courtney
as Brigadier Lethbridge-Stewart

Fulton Mackay
as Dr. Quinn

Norman Jones
as Major Baker

Peter Miles
as Dr. Lawrence

Thomasine Heiner
as Miss Dawson

John Newman
as Spencer

Geoffrey Palmer
as Masters

Ian Cunningham
as Dr. Meredith
CinemaSerf
I struggle a bit with the eight parters. The story is often far too thinly spread out and the plot advances at a glacial pace until it's all wrapped up in episodes seven and eight. This one is slightly different, though, as it neatly separates into two semi-stories. The first sees the "Doctor" (Jon ...