The Corbomite Maneuver
SPOCK: In chess, when one is outmatched, the game is over. Checkmate.
KIRK: Is that your best recommendation?
SPOCK: I'm s-- I regret that I can find no other logical alternative.
The Devil in the Dark
KIRK: I'm sorry, Mister Spock, but I'm afraid the creature must die.
SPOCK: I see no alternative myself, Captain.
The City on the Edge of Forever
UHURA: Captain, it seems impossible. Even if you were able to find the right date--
SCOTT: Then even finding McCoy would be a miracle.
SPOCK: There is no alternative.
The Doomsday Machine
DECKER: Doctor, you are out of line.
MCCOY: So are you, sir. Well, Spock?
SPOCK: Unfortunately, Starfleet Order 104, Section B, leaves me no alternative.
The Apple
LANDON: Yes, I suppose if someone were to fall off a cliff or something, that might upset the balance of the population. Then they would need a replacement.
KIRK: They'd need a replacement. Opinion, Mister Spock?
SPOCK: I see no alternative.
Journey to Babel
AMANDA: You're going to use it on yourself. A transfusion from you to your father.
SPOCK: It would seem the only answer.
MCCOY: It could damage you internally. It could kill you. I'm sorry, Spock. I can't sanction it.
AMANDA: And I refuse to permit it. I won't risk both of you.
SPOCK: Then you automatically condemn Sarek to death. And you, Doctor, have no logical alternative either.
A Piece of the Action
KIRK: Then you don't mind if I play a hunch?
SPOCK: I'm not sanguine about hunches, Captain, but I have no practical alternative.
The Cloud Minders
SCOTT: Well, are we going to do anything about it?
SPOCK: Until the High Advisor is alone or can be isolated, the captain will have to wait. Unless you have an alternative?