Romulan Commander: It is unworthy of a Vulcan to resort to subterfuge.
Spock: You're being clever, Commander. That is unworthy of a Romulan.
[Spock has fended off an attack from Kirk by grabbing his face, after which Kirk falls to the floor]
Dr. McCoy: What did you do? WHAT DID YOU DO?
Spock: I was unprepared for his attack. I instinctively used the Vulcan death-grip.
Dr. McCoy: [examines the Captain] Your instincts are still good, Mr. Spock. The Captain is dead!
Romulan Commander: We were not aware of Vulcans aboard the Enterprise.
Spock: Starfleet is not in the habit of informing Romulans of its ship's personnel.
Chekov: You're alive!
Uhura: They said you'd been killed, sir.
Captain James T. Kirk: The report was premature.
Chekov: Captain, your ears. What happened?
Captain James T. Kirk: We'll discuss it later. Mister Sulu, lay in a course for home. Mister Chekov, take the sensors. Mister Spock is still aboard the Romulan flagship. I want his body readings pinpointed and isolated. That was not a request, gentlemen.
Chekov: Aye, sir.
Sulu: Aye, sir.
Uhura: Aye, sir.
Dr. McCoy: [voice-over] Enterprise Medical Log, stardate 5027.3, Dr. Leonard McCoy recording. I'm concerned about Captain Kirk. He shows indications of increasing tension and emotional stress.
Chekov: I have completed the assignment, Captain: a theoretical incursion...
Captain James T. Kirk: Yes, Mr. Chekov, I can read, and as usual, your theoretical evaluations do not tally with mine. Return to your duty, and I'll let you know when your work is satisfactory. Mr. Spock, full sensor scan on the region, please.
Spock: I did give a full report on it just...
Captain James T. Kirk: Yes, Mr. Spock, that was the past. I'm concerned with the present.
Captain James T. Kirk: [to the Bridge crew] Or is it becoming too much for this crew to present me with current information?
Spock: No, sir. Compliance presents no problem.
Captain James T. Kirk: Then, Mr. Spock, comply.
Spock: Sensor scan to one-half parsec... Negative, Captain.
Captain James T. Kirk: Very well.
Dr. McCoy: [voice-over] I can find no reason for the Captain's behavior, except possibly that we've been on patrol too long without relief and diversion. He has resisted all of my attempts to run a psychological profile on him.
Sulu: Maintaining course and speed, sir.
Captain James T. Kirk: Change course. Come about to 185, mark 3.
Sulu: But sir, that'll lead us directly into the Romulan Neutral Zone.
Captain James T. Kirk: Yes, very perceptive, Mr. Sulu. I know where the course change takes us. Execute.
Sulu: Aye, sir.
Uhura: Doctor, you must beam aboard the Romulan flagship immediately; there's been an injury.
Dr. McCoy: I don't make house calls.
Uhura: Doctor, it's Captain Kirk!
Romulan Commander: [to Spock] If you'll give me a moment. The soldier will transform herself... into a woman.
Romulan Commander: I neglected to mention. I'll expect you for dinner. We have much to discuss.
Romulan Commander: Allow me to... to rephrase. Will you join me for dinner?
Spock: I am honored, Commander. Are the guards also invited?
Spock: I cannot allow the Captain to be further destroyed. The strain of command has worn heavily upon him. He has not been himself for several weeks.
Captain James T. Kirk: That's a LIE!
Spock: As you can see, Captain Kirk is a highly sensitive and emotional person. I believe he has lost the capacity for rational decision.
Captain James T. Kirk: SHUT UP, Spock!
Spock: It is regrettable that you were made an unwilling passenger. It was not intentional. All the Federation wanted was the cloaking device.
Romulan Commander: The Federation. And what did you want?
Spock: It was my only interest when I boarded your vessel.
Romulan Commander: And that's exactly all you came away with.
Spock: You underestimate yourself, Commander.
Subcommander Tal: No one should decide quickly to die, Captain. We give you one of your hours. If you do not surrender your ship at the end of that time, your destruction is certain.
Scott: They caught us right enough.
Captain James T. Kirk: Well, that's a brilliant observation, Mr. Scott. Do you have any other helpful opinions?
Scott: Well, we've not got many choices.
Captain James T. Kirk: We have three: We can fight, and be destroyed; or we can destroy the Enterprise ourselves and keep her from the Romulans, or we can... surrender.
[Kirk has asked his crew for their opinions regarding the threat of the Romulans]
Spock: If we had not crossed the Neutral Zone, on your order, you would not now need our opinions to support a decision which should never have had to be made.
Captain James T. Kirk: My neck feels like it's been twisted off.
Dr. McCoy: That's the Vulcan death-grip for you.
Dr. McCoy: You took a big chance that they didn't start an autopsy!
Spock: I believe the Romulans have developed a cloaking device, which renders our tracking sensors useless.
Scott: I've got the device installed, but... bless me if I know whether it's going to work. It's the biggest guess I've ever made.
Captain James T. Kirk: What earns Spock your special interest?
Romulan Commander: He is a Vulcan. Our forebears had the same roots and origins. Something you wouldn't understand, Captain. We can appreciate the Vulcans, our distant brothers.
Romulan Commander: There's no force that I can use on a Vulcan that will make him speak. That is a fact. But there are Romulan methods completely effective against Humans, and Human weaknesses.
Spock: You would not resort to them, Commander. They would prove ineffective against the Captain.
Romulan Commander: Then they will leave him dead. Or what might be worse than dead.
[the Romulan commander has accused Kirk of espionage]
Captain James T. Kirk: We were not spying, Commander.
Romulan Commander: Your language has always been most difficult for me, Captain. Perhaps you have another word for it.
Romulan Commander: You are a superior being. Why do you not command?
Spock: I do not desire a ship of my own.
Romulan Commander: Or is it that no one has offered you, a Vulcan, that opportunity?
Spock: Such opportunities are extremely rare.
Romulan Commander: For someone with your capabilities and accomplishments, opportunities are made. And will be. I will see to that, if you'll stop looking on the Federation as the whole universe. It is not, you know.
Spock: That thought has occasionally crossed my mind.
Romulan Commander: Romulan women are not like Vulcan females. We're not dedicated to... pure logic, and the sterility of non-emotion. Our people are warriors. Often savage. But we are also many other pleasant things.
Captain James T. Kirk: Commander, you'll forgive me if I put up a fight.
Romulan Commander: Of course. It's expected.
[Spock has deceived the Romulan commander to help steal the Romulans' cloaking device]
Romulan Commander: You must be mad.
Spock: I assure you, I am quite sane.
Romulan Commander: Why would you do this to me? What are you that you could do this?
Spock: First Officer of the Enterprise.
[the Romulan commander realizes that Spock has betrayed her and slaps him]
Spock: [dispassionately] What is your present form of execution?
Romulan Commander: It was your choice.
Spock: It was the only choice possible. You would not respect any other.
Spock: [to the Romulan commander] Military secrets are the most fleeting of all. I hope that you and I... exchanged something more permanent.
[Kirk has earlier been surgically altered to look like a Romulan]
Dr. McCoy: Sickbay to Bridge.
Captain James T. Kirk: What is it, Bones?
Dr. McCoy: If all the shouting's over up there, I'd like for you to report to Sickbay.
Captain James T. Kirk: What for?
Dr. McCoy: Well, you're due in surgery. I am going to bob your ears.
Spock: Captain, please go. Somehow, they do not look aesthetically agreeable on Humans.
Dr. McCoy: Well, are you coming, Jim, or do you wanna go through life looking like your First Officer?
Captain James T. Kirk: I'm on my way.
Nurse Christine Chapel: [after seeing the Captain is alive] Doctor! Dr. McCoy! Dr. McCoy!
Dr. McCoy: [entering] I left orders that no one was to come in here.
Nurse Christine Chapel: But he's alive! Alive!
Dr. McCoy: Well, now that you know it, you might as well assist me. Hand me the physio-stimulator.
Nurse Christine Chapel: But he was dead. Their doctors certified he was dead.
[hands over stimulator]
Dr. McCoy: Spock gave him a nerve pinch to simulate death.
Nurse Christine Chapel: [relieved] Then Mr. Spock isn't a traitor. And you knew that all the time and you didn't...
Dr. McCoy: I didn't know it until I beamed aboard the Romulan ship. Jim and Spock were operating under Federation orders.
Captain James T. Kirk: Ohh, ohh, my neck feels like it's been twisted off.
Dr. McCoy: That's the Vulcan Death Grip for you.
Nurse Christine Chapel: There's no such thing as a Vulcan Death Grip.
Captain James T. Kirk: Ah, but the Romulans don't know that. Sure fooled the doctors.
Dr. McCoy: You took a big chance that they didn't start an autopsy.
Captain James T. Kirk: [to Nurse Chapel] As far as the rest of the crew is concerned, I'm still dead.
Nurse Christine Chapel: Why?
Captain James T. Kirk: That's what this whole masquerade was about - to keep the Enterprise and the Federation off the hook.
Dr. McCoy: So that if anything went wrong, you would be the one to blame.
Captain James T. Kirk: Bones, I want you to prepare for surgery.
Dr. McCoy: What for?
Scott: All right, Doctor, what's so urgent that...
[sees the Captain]
Scott: Captain? Captain Kirk.
Captain James T. Kirk: Yes.
Scott: You look like the Devil himself, but as long as you're alive. What's it all about?
Captain James T. Kirk: Are those Romulan officers still aboard the ship?
Scott: They're in the brig, sir.
Captain James T. Kirk: I'll need a Romulan uniform.
Scott: [smiling broadly] Ah, it'll be a pleasure!