The original 1963 BBC production has been called "one of the great missing masterpieces of British television.
Australian TV drama was relatively rare at the time and only occasionally produced science fiction.
Other examples of Australian science fiction on TV include The End Begins (1961), Tomorrow's Child (1957) and The Stranger.
"[3] The Sydney Morning Herald review complained that the story was "too feeble to stand up to scrutiny".
[7] A BBC Radio 4 audio adaptation, written by Toby Hadoke and directed by Charlotte Riches, aired on 27 October 2018.