On July 10, 1979 the TV show “Sapphire & Steel” made its debut in the UK.
“All irregularities will be handled by the forces controlling each dimension. Transuranic heavy elements may not be used where there is life. Medium atomic weights are available: Gold, Lead, Copper, Jet, Diamond, Radium, Sapphire, Silver and Steel. Sapphire and Steel have been assigned.”. These words accompanied episode’s opening theme and offered a good part of the limited explanations about the show’s protagonists.