|Story Code: 6N / Season 21||UK Airdate: 26 Jan to 3 Feb 1984||Doctor: Peter Davison|
|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 States||from Nov 84||NTSC|
|United Arab Emirates||Dec 87||PAL|
|New Zealand||Jun 89||PAL|
US TV Guide descriptions
Title: none for compilations
- Part 1: The Tardis crash-lands on a remote planet colonized by earthlings that have been plagued by meteorite showers.
- Part 2: The Doctor is suspected of being the invisible enemy materialized on Frontios.
- Part 3:
- Part 4:
- Compilation: An outpost of humans comes under attack by an ancient foe.