The evanescent nature of time binds together the creative realms of David McCallum and P.J. Hammond, showcasing a nuanced narrative journey from the mystical enchantment of “Ace of Wands” to the temporal mysteries of “Sapphire & Steel.” As we reminisce about McCallum’s passing on September 25, 2023, the intricate tapestry of these visionary pursuits unravels, revealing a cherished epoch of British television where the realms of the known and unknown intriguingly coalesced.