'Blood Heat', written by Jim Mortimore, features the Seventh Doctor, Ace and Bernice.
Back Cover Blurb
'Not men, Ace. Silurians. The original rulers of the Earth.'
The TARDIS is attacked by an alien force; Bernice is flung into the Vortex; and the Doctor and Ace crash-land on Earth.
An attack by dinosaurs convinces the Doctor that he and Ace have arrived in the Jurassic Era. But when they find a woman being hunted by intelligent reptiles, he begins to suspect that something is very wrong.
Then they meet the embittered Brigadier Lethbridge-Stewart, leading the remnants of UNIT in a hopeless fight against the Silurians who rule his world. And the find out that it all began when the Doctor diedů