Richard Franklin reads the thrilling novelisation of a classic TV adventure featuring the Third Doctor, as played by Jon Pertwee. Eminent scientist Emil Keller is rolling out a revolutionary fresh process for the treating hardened criminals. His invention, the Keller Machine, is being heralded as a major scientific discovery.But Professor Keller is in truth the Master, and the Keller Machine is much greater than a mere machine.Soon the Doctor, Jo, the Brigadier and UNIT get excited about a bitter struggle with the Master, an alien brain parasite, and a diabolical structure to plunge the globe into a UNDER-DEVELOPED War… Richard Franklin, who played Captain Mike Yates in the BBC TV series, reads Terrance Dicks’s novelisation of a 1971 Television serial by Don Houghton.