John Leeson stars within this thrilling novelisation of the classic experience for the Fourth Doctor – as well as the introduction of K9.

A mysterious cloud drifts menacingly through space, and the Doctor becomes infected with the Nucleus of a malignant Pathogen that threatens to destroy his mind. In the mean time, on Titan, human being slaves prepare the Hive from which the Pathogen will swarm out and infect the world. In search of a cure, Leela takes the Doctor towards the Bi-Al Base, where they make an unbelievable journey into the Doctor’s brain in an attempt to destroy the Nucleus.

Can the Doctor free himself from your Nucleus with time to reach Titan and destroy the Hive? Luckily he offers help – in the strangely dog-like shape of a mobile pc called K9…

John Leeson, who was the Voice of K9 in it series, reads this unabridged novelisation of the 1977 tv serial.