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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  • Rating: TV-PG
  • Premise: Capt. Kirk, Mr. Spock, Dr. McCoy and the USS Enterprise crew seek out new civilizations in this seminal sci-fi series. The ship's five-year mission may have only lasted three seasons on NBC, but its impact has proved timeless. By the 1970s, its rabid fans-… (more)

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