A changeling. An ancient Earth legend, Mr Spock. ibid. Kirk
During an ion storm my landing party has beamed back to the Enterprise and found it and the personnel changed. The ship is subtly altered physically. Behaviour and discipline has become brutal, savage. Star Trek s2e4: Mirror Mirror
Not our universe, not our ship, something parallel. Parallel universe coexisting with ours on a parallel plane. ibid.
Terror must be maintained or the empire is doomed. It is the logic of history. ibid. Mirror Spock to Kirk
You are a man of integrity in both universes, Spock. ibid. Kirk
It was far easier for you as civilised men to behave like barbarians than it was for barbarians to behave as civilised men. ibid. Spock to Kirk & McCoy
Chekov: It makes me homesick. Just like Russia.
McCoy: More like the Garden of Eden, Ensign.
Chekov: Of course, Doctor. The Garden of Eden was just outside Moscow. A wery nice place. It must have made Adam and Eve wery sad to leave.
Kirk: Just … outside Moscow, all right. Star Trek s2e5: The Apple
Captain, sensors show this entire solar system has been destroyed. Star Trek s2e6: The Doomsday Machine
The ship was attacked by what appears to be essentially a robot – an automated weapon of immense size and power. ibid.
A doomsday machine someone used in a war uncounted years ago. ibid. Kirk
There is a curse on your ship. Leave this place or you will all die. Star Trek s2e7: Cat’s Paw s
Dungeons, Curses, Skeletons and Iron Maidens – they’re all Earth manifestations. Why? ibid. Kirk
Don’t let her touch the wand, Captain. ibid. Spock
I assure you we are no threat to humanity. Or humanoid life. We mean you no harm. But we require your ship. Star Trek s2e8: Android to Kirk & Spock
I don’t believe it: Harry Mudd. ibid. Kirk
We are programmed to function as human females, lord. ibid. female androids to Chekov
We cannot allow any race as greedy and corruptible as yours to have free run of the galaxy. ibid. male android to Kirk et al
Believe me, Captain, immortality consists mostly of boredom. Star Trek s2e9, Cochrane
We’re on over a thousand worlds and spreading out. Life is everywhere. ibid. Kirk
Captain, Ambassador Sarek and his wife are my parents. Star Trek s2e10: Journey to Babel, Spock
The Enterprise has been assigned to transport ambassadors of Federation planets to this vitally important council. The issues of the council are politically complex. ibid. Kirk’s log
If you do not operate, Sarek will die. You now have the means to perform the operation. I am volunteering myself as the blood donor. ibid. Spock to McCoy
Spock: Revenge, Captain?
Kirk: Why not? Star Trek s2e11: Friday’s Child
3478.2: On a routine mission to re-supply the experimental colony on Gamma Hydra IV we discovered a most unusual phenomenon: of the six members of the colony, none of whom were over thirty, we found four had died and two were dying of ... old age. Star Trek s2e12: The Deadly Years, Kirk’s log
It’s possible the Klingons have a new weapon and are using this colony as guinea pigs. ibid. Kirk in briefing room
Is there something I can do for you? ibid. Kirk to bird
I see Captain James Kirk – a man of morality, decency, handsome and strong. ibid. Doctor Janet Wallace
I’m not old, Jan ... My brain’s as sharp as it ever was. Simple case of radiation poisoning, they relieve me of my command? ibid. Kirk
Spock: Pure Tritanium.
Kirk: Fantastic. Twenty times as hard as diamond. Star Trek s2e13: Obsession
If you see any gaseous cloud, fire immediately. ibid. Kirk to ground crew
Let’s assume that it’s something so completely different that our senses wouldn’t identify it as a life-form. ibid. Kirk to Spock
I am getting a little tired of my senior officers conspiring against me. ibid. Kirk on bridge
Obsession for one: the persistent single-minded fixation on one idea. ibid. Spock to Doctor
While on therapeutic shore leave Mr Scott has fallen under suspicion of having brutally murdered an Argellian woman. Star Trek s2e14: Wolf in the Fold
All right, Mr Spock, what do we have? A creature without form, that feeds on horror and fear, that must assume a physical shape to kill. ibid. Kirk
For the next five or six hours we’re gonna have the happiest crew in space. ibid.
Scott: When are y’ gonna get off that milk diet, lad?
Chekov: This is vodka!
Scott: Where I come from, that’s soda pop. Now, this is a drink for a man.
Chekov: Scotch?
Scott: Aye.
Chekov: It was invented by a little old lady from Leningrad! Star Trek s2e15: The Trouble with Tribbles
Its trilling seems to have a tranquillizing effect on the human nervous system. ibid. Spock stroking tribble
The nearest thing I can figure out is that they are born pregnant. Which seems to be quite a time saver. ibid. McCoy on bridge
I transported the whole kit and kaboodle into their engine room where they’ll be no tribble at all. ibid.
The normal transporter sequence has been interrupted and we find ourselves on a strange and hostile planet surrounded by creatures belonging to races scattered all through the galaxy. Star Trek s2e16: The Gamesters of Triskelion, Kirk’s log
We have found ... that all life-forms in the galaxy are capable of superior development. ibid. Kirk
All your people must learn before you can reach for the stars. ibid.
So we’re going down to re-contaminate them? Star Trek s2e17: A Piece of the Action, McCoy to Kirk & Spock
You guys never seen a hit before? ibid.
Kirk: Are you afraid of cars?
Spock: Not at all, Captain. It’s your driving that alarms me. ibid.
Approaching Star Base VI for a much need period of rest and recreation. Star Trek s2e18: The Immunity Syndrome, Kirk’s log
Captain, the stars are ... gone. ibid. Chekov
It’s those stimulants – they catch up with you. ibid. McCoy
When do you estimate penetration? ibid. Kirk to Spock
The captain is in deep shock. I must keep him warm and alive. Star Trek s2e19: A Private Little War, McCoy
A balance of power – the trickiest, most difficult, dirtiest game of them all but the only one that preserves both sides. ibid. Kirk to McCoy
I never had a more difficult task. ibid.
Not even a Vulcan can know the unknown, Captain. Star Trek s2e20: Return to Tomorrow
There comes to all races an ultimate crisis. ibid. Sargon
To build humanoid robots we must borrow your bodies. ibid. Sargon
Risk is our business. That’s what this starship is all about. That’s why we’re aboard her. ibid. Kirk
Mid twentieth century Earth. A nation state called Nazi Germany. Star Trek s2e21: Patterns of Force, Spock to Kirk
You should make a very convincing Nazi. ibid.