The Silurians intend to destroy Earth’s protective Van Allen Belt, destroying mankind.
As the Silurian plague quickly spreads, the Doctor desperately searches for a cure.
The Silurians infect Major Baker with a virus and release him to spread the infection.
The Doctor attempts to make peace between the humans and Silurians.
The creature from the caves, wounded and dangerous, is on the loose on Wenley Moor.
Investigating the caves, the Doctor is attacked by a dinosaur-like creature.
UNIT is summoned to Wenley Moor research station which is experiencing power losses.