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Return to Tomorrow 

The Enterprise is guided to a distant, long-dead world where survivors of an extremely ancient race - existing only as disembodied energy - desiring the bodies of Kirk, Spock and astro-biologist Ann Mulhall so that they may live again.


Ralph Senensky


Gene Roddenberry (created by), John T. Dugan (as John Kingsbridge)




Episode complete credited cast:
William Shatner ... Capt. Kirk / Sargon
Leonard Nimoy ... Mr. Spock / Henoch
DeForest Kelley ... Dr. McCoy
Diana Muldaur ... Dr. Ann Mulhall / Thalassa
James Doohan ... Scott / Voice of Sargon
Nichelle Nichols ... Uhura
George Takei ... Sulu
Cindy Lou Cindy Lou ... Nurse
Majel Barrett ... Christine Chapel


From a planet bereft of life for half a million years, the Enterprise hears the voice of Sargon, who is able to control the ship and tells them to transport to specific coordinates which target them to a subterranean chamber. The away party consisted of Kirk, Spock, McCoy and astro-biologist Ann Mulhall; the security guards they planned to take along were prevented from de-materializing. Sargon is one of only three survivors of the planet's intelligent race - pure energy, matter without form. They tell the away party that they once started life on Earth and many other places. Suddenly Sargon possesses Kirk's body, saying he requires Spock and Ann Mulhall's bodies, too, in order to give the only other survivors of his race new life. He promises the bodies will be returned after they build superior mechanical robots as their definitive bodies, then leaves Kirk's and allows them to beam up and freely make up their minds. McCoy isn't tempted by curiosity and potential benefits, but Kirk ... Written by KGF Vissers

Plot Summary | Plot Synopsis


TV-PG | See all certifications »

Did You Know?


Still photos of a smiling Spock leaning against a doorway and a non-canonical image of Bill Blackburn, dressed as the android, were used in the end credits of Star Trek: The Original Series: The Immunity Syndrome (1968). That episode was produced before this one, but did not go to air until 19 January 1968. See more »


When the two security guards fail to beam down with the rest of the team, Kirk asks Scotty if the security guard (singular) is still on the ship, just after Spock and just before Scotty each refer to them as security guards (plural). See more »


Scott: [in astonished disbelief] You're going to WHAT? Are they all right in the head, Doctor?
Dr. McCoy: [boldly] No comment.
Capt. Kirk: A simple transference. Their minds and ours.
Dr. McCoy: [sarcastically] Quite simple. Happens every day.
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Alternate Versions

Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song See more »


Featured in For the Love of Spock (2016) See more »


Music credited to Alexander Courage, although a small part of the theme resembles the main title music for 'Hollow Triumph (1948)' by Sol Kaplan, who is not credited. Sol Kaplan did contribute music to numerous episodes and is so credited when applicable.
Sung by Loulie Jean Norman
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User Reviews

Worth seeing just to see an evil Spock
8 December 2006 | by MartinHaferSee all my reviews

Okay, this is an average episode that is still pretty interesting,...though I've gotta admit that the plot is pretty hard to believe--even for a sci-fi series. Think about it--some god-like and practically immortal beings are stuck inside orbs well beneath the surface of a planet. They need to borrow some of the bodies of the Enterprise crew in order to then fashion android bodies for themselves. You'd really think that being that powerful, they wouldn't need to go through all this rigmarole! Well, regardless, there are three super-beings still alive after all these many, many millenia and so Kirk, Spock and Diana Muldaur's character allow the three beings to use their bodies temporarily. However, the being inside Spock is selfish and evil and tries to kill off his rival being and he has no intention of giving Spock back his body. It's all very unusual, but not super-compelling. The episode is worth watching but is not among their best.

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Release Date:

9 February 1968 (USA) See more »

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