DeForest Kelley as McCoy: "I don't understand. This should have been attended to immediately."

Leonard Nimoy as Spock: “How is the power transmitted?”

Barbara Babcock as Philana: “Brain waves.”

Liam Sullivan as Parmen: “Oh, come now; we are not children.”

Nimoy: “Dr. McCoy, you may yet cure the common cold.”

Sullivan: “My illness was more profoundly disturbing than I, myself, realized.”

DeForest Kelley as McCoy: “Let me give you a hypo to ease the pain.”

William Shatner as Kirk: “I guess we weren’t sufficiently... entertaining.”

Music: Dramatic segue music.

Babcock: “We instituted a mass eugenics program. We are the result. Pared down to a population of 38, we’re perfect for our utopia. We’re bred for contemplation and self-reliance... and longevity.”

(Note: The writers of this episode apparently did enough homework to know that Plato was indeed a fan of creating a better society through a form of eugenics, according to History.com, which tells us that “Eugenics literally means ‘good creation.’ The ancient Greek philosopher Plato may have been the first person to promote the idea... In one of Plato’s best-known literary works, The Republic, he wrote about creating a superior society by procreating high-class people together and discouraging coupling between the lower classes. He also suggested a variety of mating rules to help create an optimal society... Plato’s ideas may be considered a form of ancient eugenics...”)

Sullivan: “Please... find it in your heart to forgive me.”

Michael Dunn as Alexander, singing: “Forward, forward in our plan. We proceed as we began.”

Babcock: “Why even discuss it? Get rid of them.”

Sullivan: “Is there anything you can do?”

Kelley: “Well, we’re certainly going to try.”

William Shatner as Captain Kirk: “We’ve shown our good faith. Now, you show yours.”

Dunn: “Anything I can do to help, you just tell me.”

Nimoy: “The humiliation must have been most difficult for you to bear.”

Liam Sullivan as Parmen: "Sheer ignorance."

Kelley: “I’m very sorry, but that’s impossible.”

Sullivan: “I – for one – consider it a vast improvement.”

Kelley: “The infection is massive.”

Kelley: “From now on, it would be better if I handled the instruments without your help.”

Music: Dunn as Alexander, playing a drum.

Shatner, reciting verse in time with the drum: “I’m Tweedledee, he’s Tweedledum.”

Nimoy: “We’re spacemen marching to and from.”

Both: “We slithe among the mimsy toves and gyre among the borogoves.”

Shatner: “If there ever was a time to get out of here, it’s now. Kirk to Enterprise. Scotty, come in.”

Someone off-screen: “Impossible!”

Nimoy: “Quite possible... and logical.”

Kelley: “What about medicine? Why no doctors?”

Babcock: “We haven’t had any pressing need for the medical arts.”

Shatner: “Can you do anything for him?”

Kelley: “There is no medicine that can help him. He’ll have to come through this himself.”

Shatner: “To us, killing is murder – even for revenge.”

Sullivan: “After my nearly fatal infection, it has become obvious to us all that we cannot afford to be without a skilled physician.”

Dunn: “I never knew any people like you existed.”

Kelley: “The answer is no.”

Shatner: “Where I come from, size, shape, or color makes no difference.”

Shatner: “Kirk to Enterprise – acknowledge... acknowledge. Enterprise, come in. Enterpri– ... I can’t raise them.”

Nimoy: “That would be highly uncharacteristic.”

Sullivan: “I am losing patience.”

Kelley: “You won’t persuade me.”

Sullivan: “I think we will.”

Nimoy: “Plato wanted truth and beauty... and, above all, justice.”

Kelley: “It’ll take some doing, but it’s possible.”

Shatner: “Well, what are we waiting for?”

Sullivan: “What is your prognosis, Doctor?”

Kelley: “I’ll let you know when I have the results.”

Sullivan: “None of us can be trusted. Uncontrolled, power will turn even saints into savages, and we can all be counted upon to live down to our lowest impulses.”

Michael Dunn as Alexander: "I sing. I dance. I play all variety of games. And, I'm a good loser, a very good loser. Please, uh, try to bear that in mind."

Shatner: “You’re very good at making speeches. Just make sure this one sinks in.”

Shatner: “I’ll handle it down here. Standby.”

Sullivan: “In your culture, justice is the will of the stronger.”

Dunn: “All I ask is one thing – If you do make it out of here, take me with you.”

Sullivan: “Do not take that tone with me.”

Sullivan: “My humble apologies. You were badly used.”

Someone off-screen: “What is this??”

Babcock: “What’s going on??”

Sullivan: “I know what you’re thinking.”

Dunn: “The sight of you and your academicians sickens me. Despite your brains, you’re the most contemptible things that ever lived in this universe.”

William Shatner as Kirk: "When we run analysis, we should have some explanation."

Leonard Nimoy: "An abundance of literature, which I shall have translated and processed."

William Shatner: "Check circuits for malfunction. Kirk out."

DeForest Kelley: "It must be a malfunction."

Leonard Nimoy: "A most puzzling phenomenon, Captain. I shall have to study it further."

DeForest Kelley as McCoy: "I'm a doctor, not a coal miner."

William Shatner as Kirk: "Get that ship out of here. Stay at minimum distance for absolute safety."

Man: "I don't think I can stand another week in this godforsaken place."