The Invisible Enemy

Written by: Bob Baker, Dave Martin

1st Aired: 1 Oct 77-22 Oct 77

Companions: Leela, K9

Location: Titan and an asteroid, circa 5000A.D.

"Contact has been made." A lot of people are suddenly saying this, first on Saturn's moon Titan and then at the medical research facility in the asteroid belt. It means that an intelligent space-borne virus has taken over th person's mind. The Doctor becomes the virus's most important host body, home of the viral nucleus itself. Only Leela in immune. Ordered to kill Leela, the Doctor fights the influence, putting himself in a coma. Leela takes the Doctor to a medical facility in the asteroid belt for treatment. Aided by Marinus' computer dog K9, Leela fights off the infected humans while the Doctor and Marinus hatch a plan. The Doctor and Leela are cloned, and the clones shrunk down so that they can enter the Doctor's body via hypodermic needle. The unstable clones have only ten minutes to live, so they must hurry to find the interloping nucleus. Meanwhile, in the world outside the Doctor, Marinus and even K9 are being infected.

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