Leonard Nimoy credited as playing...
Mr. Spock
- Dr. McCoy: Unusual eye arrangement. I might've known he'd turn up something like that.
- Capt. Kirk: What's that, doctor?
- Dr. McCoy: I said, please don't tell Spock I said he was the best first officer in the fleet.
- Spock: Why thank you, Dr. McCoy.
- Capt. Kirk: You've been so concerned about his Vulcan eyes, Doctor, you forgot about his Vulcan ears.
- Capt. Kirk: Mr. Spock, regaining eyesight would be an emotional experience for most. You, I presume felt nothing?
- Spock: Quite the contrary, Captain, I had a very strong reaction. My first sight was the face of Dr. McCoy bending over me.
- Dr. McCoy: Hm, 'tis a pity brief blindness did not increase your appreciation for beauty, Mr. Spock.
- Spock: I am a Vulcan, doctor. Pain is a thing of the mind. The mind can be controlled.
- Capt. Kirk: You're only half Vulcan. What about the human half?
- Spock: It is proving to be an inconvenience, but it is managable.
- [the landing party shoots down one of the alien life forms]
- Spock: Incredible. Not only should it have been destroyed by our phasers, it does not even register on my tricorder.
- Yeoman Zahra: Captain, it doesn't even look real.
- Spock: It is not life as we know or understand it, yet it is obviously alive. It exists.
- Capt. Kirk: And it can bear up under full phaser power.
- Spock: [presenting the first findings on the alien creature] Interesting, gentlemen. A one-cell creature resembling, more than anything else, a huge, individual brain cell.
- Capt. Kirk: Yes. That would answer a lot of questions.
- Spock: Do you understand what I'm suggesting, Captain?
- Capt. Kirk: I think so. This may be one cell in a larger organism, an incredibly huge organism, in fact.
- Spock: And although it is not physically connected to the other cells, it is, nevertheless, part of the whole creature, guided by the whole, drawing its strength from the whole, which probably accounts for its unusual resistance to our phaser weapons.