Scotty was at his best commanding the Enterprise. He defied the pacifist Ambassador to lower the shields. Then he moved the Enterprise out of orbit and told Anan 7 that all cities had been plotted and programmed into the ships weapons systems and that the entire destruction of the planet would be initiated in one hour.
Scott: The best diplomat I know is a fully activated phaser bank.
Scott: Aye. The haggis is in the fire for sure, but I’ll not lower my defenses on the word of that mealy-mouthed gentleman down below. Not until I know what happened to the captain.