Leonard Nimoy as Spock: "Irritating? Ah yes, one of your Earth emotions."

William Shatner as Kirk: "Will you try for one moment to feel? At least act like you've got a heart?"

Shatner: "I believe there's some hope for you after all, Mr. Spock."

Nimoy: "All station personnel are dead."

William Shatner as Captain Kirk: "What caused it?"

Nimoy: "Unknown, Captain... It's like nothing we've dealt with before."

Leonard Nimoy as Mr. Spock: "I wish I could say, Captain. The circumstances were quite bizarre."

George Takai as Mr. Sulu: "I'll protect you, fair maiden!"

Nichelle Nichols as Uhura: "Sorry – Neither!"

DeForest Kelley ad Dr. McCoy: "Well, we're doing everything that's possible."

William Shatner: "Bones, I want the impossible checked out, too."

Bruce Hyde as Lt. Kevin Riley : "Ya know what Joe's mistake was?... He wasn't born an Irishman."

James Doohan as Mr. Scott: "I can't change the laws of physics!"

Majel Barrett as Nurse Chapel: "I'm in love with you, Mr. Spock."

Kelley: "Your pulse is 242, your blood pressure is practically nonexistent... assuming you call that green stuff in your veins blood."

Nimoy: "The readings are perfectly normal for me, Doctor, thank you. And as for my anatomy being different from yours, I am delighted."

Leonard Nimoy as Spock: "If I seem insensitive to what you're going through, Captain, understand... it's the way I am."

DeForest Kelley as Dr. McCoy: "He's dead, Jim."

Ominous music.