Casting Mitchum was the worst possible choice the producers could have made. In each scene in which Mitchum appears, your eyes immediately notifier your brain that something is very wrong here, RM was 25 years too old to play the part. And with Mitchum and his sunken, hound dog face, age could not be erased through makeup or some other miracle the make up people dreamed up.
Mitchum was regarded as "the worst pain in the ass, we have ever worked with" by many of his co-stars, his directors and producers. You might say that he paid the producers back double for handing him the role. I didn't find Polly Bergen convincing, her talent runs quite shallow when playing a character through such a long period of time and in so many changes.
With so many 1 hour segments (44 minutes w/o ads) you have to be pretty disciplined to devote the time to see each in order. There is some review of the previous segment but not enough to catch you up if you missed one.
It's very worth seeing, but be prepared to shake your head at Mitchum's miscasting.