Doctor Who (1963)

Season 15 Episode 5

The Invisible Enemy, Part One

Aired Saturday 5:15 PM Oct 01, 1977 on BBC
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Episode Summary

The Invisible Enemy, Part One
Deep space, 5000AD. An Earth supply shuttle is infected by a strange sentient space-borne virus, which quickly spreads to the crew of the refuelling station on the moon Titan. Even worse, the Doctor himself falls victim. But why is Leela immune, and what is the virus's ultimate goal?moreless

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    Edmund Pegge

    Edmund Pegge


    Guest Star

    Jay Neill

    Jay Neill


    Guest Star

    Anthony Rowlands

    Anthony Rowlands


    Guest Star

    Michael Sheard

    Michael Sheard


    Recurring Role

    Brian Grellis

    Brian Grellis


    Recurring Role

    John Leeson

    John Leeson

    Nucleus Voice

    Recurring Role

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    Trivia, Notes, Quotes and Allusions


    • TRIVIA (7)

      • Throughout the serial, signs appear with odd spellings (e.g, "Isolayshun Ward"). This was intended to indicate that English had changed in the future to phonetic spellings.

      • Continuity: Leela and the Doctor use different console levers to operate the TARDIS doors.

      • Revealing Mistake: The knife that Leela kills Meeker with is very obviously loosely sewn to his clothes. Notice how it wobbles back and forth after he falls.

      • Continuity: Lowe's "frozen" makeup changes between when he emerges from the freezer and when Leela brings him a cup of coffee.

      • Factual Error: The surface of Titan – rocky with a clear view of Saturn – is inconsistent with what was known about Titan at the time the episode was made. It should be gaseous with an opaque orange sky.

      • Other Goof: When the shuttle lands on Titan, the Captain flips down all the switches on the control. But he misses one.

      • This is the first appearance of K-9, the Doctor's robotic companion.

    • QUOTES (5)

      • Leela: Where are we?
        The Doctor: Number two control room. It's been closed for redecoration. I don't like the colour.
        Leela: White isn't a colour.
        The Doctor: That's the trouble with computers, always thinking in black and white. No aquamarines, no blues. No imagination!

      • Leela: Halo?
        The Doctor: Why do keep repeating everything I say? You're not a parrot, are you?
        Leela: Parrot?
        The Doctor: Yes. A parrot's a bird that repeats things. Move over.
        Leela: Move over!

      • Leela: Doctor, are you all right?
        The Doctor: Rightly perfect, thank you, Lalee.
        Leela: My name is Leela.
        The Doctor: I know your name.
        Leela: What happened?
        The Doctor: I must have had a bot of a shick.
        Leela: What?
        The Doctor: A bot of a shick.

      • [examining a corpse]
        Leela: He's still warm.
        The Doctor: Don't be gruesome.
        Leela: I am a hunter...
        The Doctor: You're a savage!
        Leela: Perhaps--I am not ashamed of what I am. And I tell you, I can smell danger.

      • Leela: I thought you liked humanity.
        The Doctor: Oh, I do, I do. Some of my best friends are humans. But when they get together in great numbers, other life-forms sometimes suffer...

    • NOTES (5)

      • Novelisation: Doctor Who and the Invisible Enemy by Terrance Dicks (ISBN 0 426 20054 3) first published by W H Allen in 1979.

      • DVD: Doctor Who: The Invisible Enemy (BBCDVD 2799) released as part of the Doctor Who: K-9 Tales box set (BBCDVD 2439) in June 2008. The DVD includes extensive alternate CGI effects.

        Video: Doctor Who: The Invisible Enemy (BBCV 7267) released in September 2002. Released in U.S.A./Canada (Warner Home Video E1859) in October 2003.

      • Working titles: The Enemy Within, The Invisible Invader, and The Invader Within.

      • This episode introduces a new TARDIS console after the Season 14 wood-panelled one was damaged in storage.

      • The robot dog K-9 was created after one of the writers' pet dogs was repeatedly run over by local buses. Understandably disgruntled, he created a dog more than capable of holding its own in that sort of situation.

    • ALLUSIONS (0)