Spock Gets Infected With The Psi 2000 Virus

Spock tours the ship, urging Scotty to expedite his efforts in re-taking engineering, ordering an infected crewman to stop romantically serenading Yeoman Rand, and checking on McCoy's progress. When Spock enters Sickbay, he finds himself alone with Chapel, who confesses her love for Spock, infecting him. Ignoring repeated hails from the bridge, Spock's emotional state quickly weakens, so he secludes himself in the briefing room, but not before suddenly breaking down and crying.