Sapphire and Steel is een Britse sciencefictionserie van de zender ITV1. De serie ging in première op 10 juli 1979.
Sapphire en Steel zijn twee wezens die als tijdagenten opereren tussen de verschillende dimensies. De belangrijkste dimensie is de tijd, een kracht die de gewone dimensies omringt.
Sapphire succeeds in making contact with the darkness at a great personal risk. Steel negotiates with it by promising a powerful source of resentment in exchange for a return to present day. The solider finally reveals what it is the darkness has promised all the ghosts but Steel gives them a better offer. The darkness follows through with its part of the bargain and Sapphire and Steel must uphold their part as well, even if their actions damage time itself.