(Paperback)

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.

(Paperback)

The Doctor and Sarah arrive in London to find it deserted. While the Doctor works to discover who or what is bringing the dinosaurs to London, Sarah finds herself trapped on a spaceship that left Earth months ago travelling to a new world

Against the odds, the Doctor manages to trace the source of the dinosaurs.