Always Like McCallum and enjoyed his work. My wife and I still laugh about how one day decades ago he came up in a conversation with my mother and she said about him "Oh that communist!" Apparently because he played a Russian character in The Man Frum Uncle she assumed that he was one in real life. The truth is that McCallum was actually quite conservative in his political views including the need for strong families.
I came across and old series he did offered on I think Tubi, called Sapphire and Steel from 1979 that I meant to check out, sounds interesting from the synopsis, the Brits did a lot of shows like this at that time.
A special force of interdimensional operatives protect the universe from evil forces trying to gain a foothold by disrupting the timeline. The strange energy beings are assigned to cases, when and where needed, and materialise on Earth as humans, each with specialist abilities to ascertain and then solve the problems.