Title: Doctor Who The Mind of Evil
First published: July 1985
Description: Eminent scientist Emil Keller has developed a revolutionary new process for the treatment of hardened criminals. His invention, the Keller Machine, is being heralded as a major scientific breakthrough.

But Professor Keller is in truth the Master and the Keller Machine is much more than a mere machine. Soon the Doctor is involved in a bitter struggle with his deadliest enemy, an alien mind parasite, and a diabolical scheme to plunge the world into a Third World War...
Subjects: Doctor Who (Fictitious character), Fiction, Time travel, Space and time, Science fiction
People: Doctor Who, Jo Grant, The Master