Two mysterious agents (Joanna Lumley & David McCallum) who repair ruptures in time.
No-one, but no-one, actually understood this programme.
Opening Narration :
All irregularities will be handled by the forces controlling each dimension. Trans-uranic 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.