A single blow from the giant, hairy paw smashes the explorer to the ground. Terrified, he flees from the monster’s glowing eyes and savage fangs. Why are the peaceful Yeti now spreading death and destruction? And what is the secret behind the glowing cave on the mountain? When Doctor Who discovers that a long-dead friend is still alive, he knows why his visit to the lonely Himalayan monastery has led to a struggle to save the Earth!