The Intrepid Just Died (The Immunity Syndrome)

Captain's log, stardate 4307.1. Approaching Starbase Six for a much needed period of rest and recreation. 
[Bridge] 
KIRK: The crew has performed excellently, but is exhausted. And I, too, am looking forward to a nice period of rest on some lovely planet. 
UHURA: Captain. There was a message from Starbase Six. Heavy interference. All I get is Intrepid and what sounded like a sector co-ordinate. 
SPOCK: Interesting. No indications of magnetic storms in this sector. 
KIRK: Try another channel, Lieutenant. 
UHURA: Aye, sir. 
MCCOY: The Intrepid is manned by Vulcans, isn't it? 
KIRK: Yes, that's right, Bones. 
UHURA: Enterprise calling Starbase Six. Enterprise calling Starbase Six. Come in. Come in. 
(Spock suddenly jerks upright, his face a picture of horror.) 
KIRK: Spock? 
MCCOY: What is it, Spock? Are you in pain? 
SPOCK: Captain, the Intrepid. It just died. And the four hundred Vulcans aboard, all dead. 
MCCOY: Come on, Spock, let's go down to Sickbay. 
SPOCK: Doctor, I know what I know. 
KIRK: Get to the Sickbay. 
SPOCK: Captain. 
KIRK: No, no, no. That's an order. 
SPOCK: Yes, sir. 
(McCoy leads him away.)