The Star Trek Fotonovels are comics created with color stills from the original TV series with speech bubbles and narration printed over the photos. Each of the 12 books is faithful to the original script. The series was published by Bantam.
I wasn’t aware of these as a kid (or I would have bought them). But thanks to the magic of e-bay, I now have the full collection. (I even bought an extra one for my brother – he’s a major Trekkie!)