Genocide (novel)

Publisher's Summary
Years after leaving UNIT, Jo Grant receives a plea for help from an old acquaintance. A palaeontological study of the earliest known humans is apparently under threat from a UNIT force led by a captain who does not officially exist. Investigating further, she begins to find herself out of her depth - and out of the twentieth century altogether...

Meanwhile, the Doctor and Sam visit Earth in 2109 - but there is no trace of the human race. Earth is home of the Tractites, a peaceful race who have been living there for hundreds of thousands of years. Astonished and appalled, the Doctor travels back in time to see just what went wrong in Earth's prehistory.

Why have Jo and the expedition been taken back in time? Are the Tractites all they seem? Finally, separated from the TARDIS, the Doctor's last chance to put things right rests with Sam - but has even she turned against him?

Characters
The Doctor
 * Mentions Davros in talking to Sam "My old friend Davros".

Sam Jones
 * Is still 17.
 * Sam mentions Zygons and Vampires (who she's met) and Daleks (who's she's yet to).

Jo Grant
 * Blasts away Tractites to make sure her future would still be there.

John Benton
 * Is now in a purely administrative position at UNIT.

Rowenna Michaels
 * Attacked and killed by wild dogs.

Julie Sands
 * Killed by wild dogs.

Mauvril
 * Mentions Earth Reptiles.

Kitig

Continuity

 * DW: The Green Death introduced Cliff Jones and showed him and Jo planning to get married.
 * The last contact the Doctor had with Jo was in the form of a letter (DW: Planet of the Spiders)
 * The model train set from ST: Model Train Set is seen.
 * The Doctor mentions Davros in this novel, he meets him in the next War of the Daleks.
 * Jo saw the jungles of Spiridon in DW: Planet of the Daleks, Axons in The Claws of Axos, Sea Devils in The Sea Devils, Autons in Terror of the Autons and Xarax in MA: Dancing the Code.