Most people don't take note of this unless you're a fan, but I remember at least four theme variations used during TOS (five if you count The Cage). Season one had two (three if you count Where No Man without Shatner intro), and a new one during year two and then a third variation during year three. I noticed over the years that very early VHS's of TOS I recorded sometime in the early 80's used the Where No Man (with Shatner intro) for about half of the first season, then the latter half used a different variation. This seemed to change somewhat once the Paramount VHS's were released. Also, I used to have a rare version which actually seemed to be an error where Shatner's intro dialogue was bunched together for the first two sentences without a pause. This didn't affect the music at all which always made me wonder if it was a blooper. I only had an audio tape of it, but I recorded it in the late 70's and it was one of the first 15 episodes. Anyone else ever run across this one? Then again, later learning how the audio stripes were created with sound effects separate from music and dialogue, it could have been that the dialogue audio stripe had to later be spliced because it split... but then again I would think this would have affected the music and it did not. Oh well, something to share and ponder.