- [last lines]
- Captain James T. Kirk: [to the alien entity] Get off my ship. You're a dead duck here, you're powerless. We know about you, and we don't want to play. Maybe... maybe there're others like you around, maybe you've caused a lot of suffering, a lot of history; but that's all over. We'll be on guard now, we'll be ready for you, so ship out! Come on, haul it!
- Dr. McCoy: Yeah, out already!
- Kang: Out! We need no urging to hate Humans. But for the present, only a fool fights in a burning house. Out!
- [as Chekov is going after the Klingons armed with a sword, Kirk tries to hold him back]
- Chekov: Don't try to stop me, Captain. I saw what they left of Pyotr. And I swore on his grave I would avenge his murder.
- [enters the turbolift]
- Sulu: What's Chekov's grudge against the Klingons? Who's... Pyotr?
- Captain James T. Kirk: His only brother, killed in a Klingon raid.
- Sulu: His brother? He never had a brother. He's an only child.
- Captain James T. Kirk: Go to the devil.
- Kang: We have no devil, Kirk. But we understand the habits of yours.
- Captain James T. Kirk: Captain's Log, stardate... Armageddon. We must find a way to defeat the alien force of hate that has taken over the Enterprise, stop the war now - or spend eternity in futile, bloody violence.
- Mr. Spock: Captain, neither the Klingon technology nor ours is capable of this - the instantaneous transmutation of matter. I doubt that they are responsible.
- Captain James T. Kirk: Any other logical candidate?
- Mr. Spock: None. However, if they had such power, would they not have used it to create more effective weapons, and only for themselves?
- Mr. Spock: Recent events would seem to be directed toward a magnification of the basic hostilities between Humans and Klingons. Apparently, it is by design that we fight. We seem to be pawns.
- Captain James T. Kirk: But what's the game? And whose? And what are the rules?
- Kang: For three years the Federation and the Klingon Empire have been at peace. A treaty we have honored to the letter.
- Captain James T. Kirk: We took no action against your ship, Kang.
- Kang: Were the screams of my crew imaginary? What were your orders, Kirk? To start a war? You've succeeded! To test a new weapon? We shall be happy to examine it.
- Captain James T. Kirk: There was a Federation colony on this planet. It was destroyed!
- Kang: By what? No bodies, no ruins. A colony of the invisible?
- Captain James T. Kirk: Yes, a test of a new Klingon weapon leaving no traces. Federation ships don't specialize in sneak attacks.
- Captain James T. Kirk: What about the armory?
- Scott: Well, I'm there now, sir, and you never saw such a fine collection of antiques in your life.
- Captain James T. Kirk: YOU received a distress call? WE received a distress call!
- Kang: I don't propose to spend the rest of my life on this ball of dust arguing your fantasies! The Enterprise is MINE!
- Captain James T. Kirk: All right. In the heart, in the head. I won't stay dead. Next time I'll do the same to you; I'll kill you! And it goes on and on - good old game of war, pawn against pawn - stopping the bad guys. While somewhere, some... thing sits back and laughs, and starts it all over again!
- Mara: We have always fought. We must. We are hunters, Captain, tracking and taking what we need. There are four planets in the Klingon systems. We must push outward if we are to survive.
- Captain James T. Kirk: There's another way to survive. Mutual trust and help.
- Uhura: Captain, why would... why would Chekov believe he has a brother?
- Captain James T. Kirk: I don't know. But he does. And now he wants revenge for a non-existent loss.
- Kang: Kirk, my ship is disabled. I claim yours. You are now prisoners of the Klingon Empire against which you have committed a wanton act of war!
- Captain James T. Kirk: [after learning there is an unknown alien on board] A brother that never existed, a phantom colony, imaginary distress calls, the creation of these... weapons. Do you sense a pattern, Mr. Spock?
- Mr. Spock: If the alien is creating these events, Captain, it is apparently capable of manipulating matter and mind.
- Captain James T. Kirk: And now it has control of the Enterprise and taking us out of the galaxy. But why?
- Mr. Spock: Captain, I am constrained to point out that since minds are evidently being influenced, we cannot know at this moment whether our own memories are completely accurate and true.
- Captain James T. Kirk: We must talk to Kang, bury the hatchet.
- Mr. Spock: [as McCoy enters] An appropriate choice of terms, Captain. However, it is notoriously difficult to arrange a truce with the Klingons once blood has been drawn.
- Dr. McCoy: Truce? Are you serious? I've got men in Sickbay, some of them dying, atrocities committed on their persons, and you talk about making peace with these fiends? If our backs were turned, they'd jump on us in a minute! And you know what Klingons do to prisoners: slave labor, death planets, experiments!
- Captain James T. Kirk: McCoy.
- Dr. McCoy: While you're talking, they're planning attacks. This is a fight to the death! We'd better start trying to win it!
- Dr. McCoy: How many more men must die before you two begin to act like military men, instead of fools?
- Dr. McCoy: Klingons claim to have honored the truce, but there've been incidents, raids on our outposts...
- Captain James T. Kirk: No proof that the Klingons committed it.
- Dr. McCoy: What proof do we need? We know what a Klingon is.
- Dr. McCoy: Those filthy butchers. There are rules, even in war. You don't keep hacking at a man after he's down.
- Mr. Spock: [deflecting Scott's maniac temper from Kirk] Easy, Mr. Scott.
- Scott: Keep your Vulcan hands off me! Just keep away! Your feelings might be hurt, you green-blooded half-breed!
- Mr. Spock: May I say that I have not thoroughly enjoyed serving with Humans? I find their illogic and foolish emotions a constant irritant.
- Scott: Then transfer out, freak!
- Kang: With your death, we win!
- Captain James T. Kirk: Nobody wins. Have any more of your men died? We can't be killed! There's an alien aboard. It wants us alive.
- Kang: Then, no doubt, you will reassemble after I have hacked you to bits!
- Mr. Spock: The cessation of violence appears to have weakened it, Captain. I suggest that good spirits might make an effective weapon.
- Kang: I have captured your Engineering section, and now control the ship's power and life support systems. I have deprived all areas except our own. You will die of suffocation in the icy cold of space.
- [power on the Bridge is cut]