'IF YOU REALLY WANT TO KNOW WHAT I THINK, THE MAN SIMPLY DIED OF FRIGHT...'
All is not well at the Wenley Moor underground atomic research station. Power is being unaccountably lost; the staff are on the verge of a strange nervous collapse and one man, his face horribly marked by some hideous claw, has been killed. The Silurians, ancient creatures who once ruled the Earth, are beginning to stir from their centuries-long slumber...
This is an adaptation by Malcolm Hulke of his own original screenplay, which featured Jon Pertwee in the role of the Doctor and which was originally published under the title The Cave Monsters.