The first B/W season was great. Probably the best episodes were "The Vulcan Affair", "The Shark Affair"(very rarely seen) and the "The Quadripartite Affair" (with McCallums wife at the time Jill Ireland).
When the show went to color and changed time slots
it got predictable.
But even in reruns it is a great fun view into the mid to late 60's.