For me, hands down, the best entrance ever is Kirk entering the bridge and saving Stocker's hide in the Deadly Years.
That was Kirk at his best!
We have a winner!
I had forgotten, but in jr high, I was out sick for a week. When I made my return to school, I got a friend to bring an audio cassette of DEADLY YEARS in, cued to that moment, and he was sitting with my other buds in the library. He started it up and I made my "report mr sulu" entrance into the library, then stomped over to the center seat I usually occupied.
Nobody else except our table 'got' it, but it was a glorious moment. The way the music is going as everything is going downhill for Stocker, and then the florish as Kirk enters ... dynamite!