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PRODUCTION INFO

Name

The Invisible Enemy

Serial Code

4T

First Transmitted

1 October 1977

Final ratings

8.60m

DVD RELEASE

DVD

VHS RELEASE

VHS

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CAST

Regular Cast

Tom Baker (Doctor Who), Louise Jameson (Leela)

Guest Cast


John Leeson (K-9), Michael Sheard (Lowe), Brian Grellis (Safran) [1-2,4], Edmund Pegge (Meeker) [1], Jay Neill (Silvey) [1], Anthony Rowlands (Crewman) [1], John Leeson (Nucleus Voice)*, Frederick Jaeger (Professor Marius) [2-4], Roy Herrick (Parsons) [2-3], Elizabeth Norman (Marius’ Nurse) [2-3], Nell Curran (Reception Nurse) [2], Jim McManus (Opthalmologist) [2-4], Roderick Smith (Cruikshank) [2-3], Kenneth Waller (Hedges) [2], Pat Gorman (A Medic) [3-4]†, John Scott Martin (Nucleus) [3-4].

CREW

Written by Bob Baker And Dave Martin
Directed by Derrick Goodwin
Produced by Graham Williams

sypnosis

A three-man shuttle crew are completing the final stages of their journey to Titan base, when a course deviation puts the shuttle in the path of a mysterious cloud in space. The crew members arrive on Titan, but they have been somehow changed, infected by an intelligent virus that threatens everyone in the galaxy.

The TARDIS picks up a Mayday message from Titan base, but before the Doctor and Leela can fully respond, the police box also passes through the mysterious cloud. With the infection spreading from person to person, the Doctor and Leela seek assistance on a medical station in the asteroid belt.

As the situation worsens, their only hope lies in the unlikely combination of the eccentric scientist Professor Marius, and his dog-shaped computer K9…

NOTES

  1. This is not the only occasion where a Doctor shall encounter a clone of himself; in Project: Lazarus, the Seventh Doctor encounters an organisation called the Forge, who have created countless clones of the Sixth Doctor due to a cellular degeneration problem with their technology, transferring the memories of the previous clone to the next one so they believe themselves to be the same Doctor throughout.
  2. K9 marks the first of only a small number of mechanical companions; other examples of these include the Fifth Doctor’s companion Kamelion (The King’s Demons to Planet of Fire), the Seventh Doctor’s companions Cat and Antimony (Companion Piece and Death Comes to Time, although both of these may take place in alternate universes), and the Eighth Doctor’s companion Compassion (Joined him in Interference: Book Two, mutated into a TARDIS in The Shadows of Avalon).
  3. This story had the working titles; The Invader Within, The Enemy Within and The Invisible Invader.
  4. This story was listed on the 1970s sound effects LP as “The Enemy Within” which would go on to become the second-hand title given to the TV Movie
  5. This is the story which introduced K9.
  6. This story also re-introduces the ‘old’ white console room (though slightly redesigned by Barry Newbery) rather than the ‘wooden’ secondary console room which debuted in The Masque of Mandragora.
  7. Leela is left-handed, or at least writes with her left hand. Actress Louise Jameson is right-handed, but chose to make Leela a left-handed writer in order to increase her awkwardness at this task.
  8. This is the only story in which the monitor on K9’s left side actually display
  9. Order the DVD

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