I was thinking the other day about the subtle ways he suggests Kirk's relationship with his crew.
In "Where No Man...", for example, when the department heads assemble on the bridge and Scotty chimes in with (paraphrasing) "Engineering ready, as always.", Kirk gives him a subtle smile. In that moment, you really feel a history and connection between them, a trust.
Things like that, Shatner gets very little credit for, but they're peppered throughout the show and movies, and do a lot to round out the characters as people, not merely functions of the script.
In "Where No Man...", for example, when the department heads assemble on the bridge and Scotty chimes in with (paraphrasing) "Engineering ready, as always.", Kirk gives him a subtle smile. In that moment, you really feel a history and connection between them, a trust.
Things like that, Shatner gets very little credit for, but they're peppered throughout the show and movies, and do a lot to round out the characters as people, not merely functions of the script.

I always get a kick out of it when anyone mocks Shatner's acting. The guy is not only not a bad actor; he's a fantastic one.
I have never seen/listened to the DVD commentary for TWOK but I'm certainly going to watch it now; thank you!