Season 1, Episode 29 Operation: Annihilate!

A trip to Deneva reveals parasitic creatures have devastated the planet, driving the inhabitants insane---and one has infected Spock. Aurelan: Joan Swift. Peter: Craig Hundley. Kartan: Dave Armstrong. Zahra: Maurishka. Nurse Chapel: Majel Barrett. Spock: Leonard Nimoy. Kirk: William Shatner. McCoy: DeForest Kelley.

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