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Doctor Who and the Invisible Enemy: 4th Doctor Novelisation
Doctor Who and the Invisible Enemy 4th Doctor Novelisation Author:Terrance Dicks John Leeson (the voice of K9) stars in this exciting novelization of a classic adventure for the Fourth Doctor?and the introduction of K9. The Doctor becomes infected with the Nucleus of a malignant Virus that threatens to destroy his mind. Luckily there is help?in the strangely dog-like shape of a mobile computer called K9.