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.
For their new assignment, Sapphire and Steel arrive at an abandoned railway station haunted by supernatural figures. Paranormal investigator George Tully has been observing the station for several weeks because he has an interest in speaking with the ghost of a young man often heard whistling in the hallways. Sapphire and Steel indulge Mr. Tully by allowing him to help their investigation but Steel warns him that the apparition is something far more dangerous than a ghost.