Leonard Nimoy as Spock: "I shall be interested in hearing your description, Captain."

William Shatner as Kirk: "That would be difficult to explain."

Leonard Nimoy as Spock: "It would be impossible, Captain."

James Doohan as Mr. Scott: "I'm doing the best I can!"

Leonard Nimoy: "I suggest no supernatural explanation. I merely point out that the facts do not fit any known categories."

Leonard Nimoy as Spock: "Please, Mr. Scott, restrain your leaps of illogic."

Leonard Nimoy: "The inconsistencies are so compounded as to present a seemingly impossible phenomenon."

William Shatner: "But, a fascinating one, Mr. Spock."

Nimoy: "Precisely, Captain."

James Doohan: "Well, that's not possible. Nothing can do that!"

Leonard Nimoy as Spock: "Can you give me warp 8?"

Doohan: "Aye, sir, and maybe a wee bit more. I'll sit on the warp engines myself and nurse them."

Nimoy: "That position, Mr. Scott, would not only be unavailing, but also undignified."

The Zetarians: "You will all die."