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.)
- When the story was rejected in April 1971 by the censors in Australia, the serial (in b/w) was then not able to be sold to any other Commonwealth country, such as New Zealand, Singapore, Hong Kong, Gibraltar.
- The only sales were to non-Commonwealth countries that broadcast in NTSC or black and white.
- It was not sold anywhere in its original PAL format. The tapes had been wiped by 1973.
- It was dubbed into Arabic.
- When the PAL tapes were converted to NTSC in 1972, an early edit of part five was used, featuring an additional scene not in the UK broadcast.
- The original PAL tapes were wiped by early 1973.
- The NTSC tapes were recovered from Canada in early 1983. They were sold for syndication in the United States a few months later.
- The tapes were returned to the BBC by December 1983.