The Invisible Enemy

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Story Code: 4T / Season 15 UK Airdate: 1 Oct to 22 Oct 1977 Doctor: Tom Baker
First airings by location UK Repeats / Foreign Cable and Satellite Previous Story / Next Story

This story aired in the following known countries. They are listed in chronological order according to known airdate. If no month is noted, the actual airdate is not confirmed, and is a close approximate. (Refer also to Selling Doctor Who for expanded airdates.)

Listing for part 1 on San Jose KTEH Channel 54, 1 June 1984
United Arab Emirates Jul 78? PAL
United States* Dec 78 NTSC
Australia Feb 79 PAL
Chile c May 79 NTSC
New Zealand Jan 80 PAL
Mexico Feb 80 NTSC
Costa Rica Feb 80 NTSC
Colombia Apr 80 NTSC
Ecuador Jun 80 NTSC
Gibraltar Jul 80? PAL
Nicaragua Aug 80 NTSC
Puerto Rico Sep 80? NTSC
Brazil 80? PAL
Brunei 80? PAL
Canada Jan 81 NTSC
Swaziland? 81? PAL
Venezuela 82? NTSC
Honduras ? NTSC
  • (*) The US date is based on the airdates for WTEV, which was the first US station to screen the initial package of 98 Tom Baker episodes.
  • This story was dubbed into Spanish (for Latin America).


  • The story was reissued in the mid-1980s, during the THIRD WAVE of sales.
Saudi Arabia early 86? NTSC
Armed Forces Network Jul 86 NTSC

US TV Guide descriptions

More Information
Title: Invisible Enemy

  • Part 1: A virus infects a space station—and Dr. Who.
  • Part 2: The nucleus of the virus settles in the Doctor's brain.
  • Part 3: Miniature clones of Dr. Who and Leela are injected into the Doctor to fight the virus.
  • Part 4: The Doctor pursues the nucleus into the atmosphere to destroy it.
  • Compilation: A virus infects a space station—and Dr. Who.