This story was broadcast as a live play on TV by the BBC in the mid-'50s. It was preceded by a solemn announcement to the effect that the hospital practices depicted bore no relationship to those of the National Health Service.
The Two Ronnies (1971) based Episode #8.1 (1980) satirizing the TV quiz show Mastermind (1972) upon a theory propounded in this film.
Donald Gray, known to British viewers for his portrayal of Mark Saber, the one-armed detective in the TV series The Vise (1954), appears with a prosthetic left arm.
Like many British science-fiction films of that period, chances for US distribution were increased by top billing two American stars, Gene Nelson (who had just come off his biggest role in Oklahoma! (1955)) and Faith Domergue.