Doctor Who and the Cave Monsters

UNIT is called in to investigate security at a secret research centre buried under Wenley Moor. Unknown to the Doctor and his colleagues, the work at the centre has woken a group of Silurians - intelligent reptiles that used to be the dominant life form on Earth in prehistoric times.

Now they have woken, the Silurians are appalled to find ''their'' planet populated by upstart apes. The Doctor hopes...