Leonard Nimoy credited as playing...
Mr. Spock
- Captain James T. Kirk: [to McCoy] You seem to be the special favorite.
- Mr. Spock: Indeed, Doctor. The young lady did show a marked preference for your company.
- Dr. McCoy: Well, now, nobody can blame her for that, can he?
- Captain James T. Kirk: Personally, I find the lady's taste questionable; but she obviously prefers you, and you obviously don't seem to mind.
- Mr. Spock: Incredible as it may seem, these people have no idea they're living on a spaceship.
- Captain James T. Kirk: I wonder how many generations have lived out their lives, and... been buried here, without ever knowing that their world is hollow?
- Mr. Spock: Captain, informing these people they're on a ship may be in violation of the Prime Directive of Starfleet Command.
- Captain James T. Kirk: No. The people of Yonada may be changed by the knowledge, but it's better than exterminating them.
- Mr. Spock: Logical, Captain.
- Captain James T. Kirk: And the three billion on Daran V.
- Mr. Spock: Also logical, Captain.
- Mr. Spock: [studying the inscriptions on a door] The writing is definitely Fabrini, Captain. I recognize it.
- Captain James T. Kirk: Fabrini... Didn't the Fabrini sun go nova and destroy its planets?
- Mr. Spock: Yes. Toward the end, the Fabrini people lived underground as these people do, to protect themselves.
- Captain James T. Kirk: Some of them must have been put aboard this ship and sent to another planet. And these... are their descendants.
- Mr. Spock: Captain. Intelligence files. Their banks contain the total knowledge of the Fabrini, ready for the people to consult when they arrive at their destination. And they seem to have amassed a great deal of medical knowledge.
- Mr. Spock: Your hemoglobin count is back to normal, Doctor, which indicates that the flow of oxygen to each cell of your body is back up to its abundantly energetic level.