Sapphire & Steel: Zero #3.3 - Big Finish Audio CD
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 Space Shuttle Aspirant is in a decaying orbit, its engines dead. Time is running out.