Season 2, Episode 20 Return to Tomorrow

An experimental transplant between formless, telepathic creatures and members of the Enterprise crew works well until the creature in Spock's body elects to keep its new form. Ann: Diana Muldaur. Kirk: William Shatner. McCoy: DeForest Kelley. Nurse Chapel: Majel Barrett. Scotty: James Doohan. Sulu: George Takei. Uhura: Nichelle Nichols.

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