I fondly remember back in the late sixties and early seventies anxiously awaiting and then enjoying each episode of "Mission: Impossible", from the opening montage to the final credits. As far as I know, no other show has (before or since) come up with anything as clever as the opening montage, where certain clips from that week's episode were shown as the theme song played, before the showing of the pictures of the stars of the show. It was always fun for me to try to pick out the scenes as the show progressed (they always looked more dramatic in the montage than they did in the actual episode). The shows were always well written and the cast did an excellent job of portraying a crew that were all good at their jobs and that even enjoyed their jobs, dangerous though they were.
And the music! Lalo Schifrin's music was excellent!