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.)
| 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 |
| Canada | Jan 81 | NTSC |
| Brunei | 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.
- The story was possibly also seen in Swaziland (1981).
Reissue
- 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.
