William Shatner as Kirk: "You belong in a circus, Spock. Right next to the dog-faced boy!"

Shatner: "All right, you mutinous, disloyal, computerized half-breed. We'll see about you deserting my ship."

Shatner: "We haven't heard much from you about Omicron Ceti III, Mr. Spock."

Leonard Nimoy: "I have little to say about it, Captain, except that for the first time in my life... I was happy."

Leonard Nimoy: "That is quite logical, Captain."

Leonard Nimoy: "I'm sure there is an answer. It simply has not yet been discovered."

DeForest Kelley as McCoy: "By golly, Jim, I'm beginning to think I can cure a rainy day!"

DeForest Kelley: "I'm a doctor, not a bricklayer!"

William Shatner: "I suspect you're becoming more and more human all the time."

Leonard Nimoy: "You... Captain, I see no reason to stand here and be insulted."

Leonard Nimoy as Spock: "Please proceed with extreme caution."

William Shatner: "Please stay out of trouble, Mr. Spock."

Leonard Nimoy: "That is always my intention, Captain."

Leonard Nimoy: "Pure energy. Pure thought. Totally incorporeal. Not life as we know it at all."

Nimoy: "Pure energy."