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.

The series centres on a pair of inter-dimensional operatives: Sapphire and Steel. They are two of several Elements that assume human form to investigate strange events.