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Once Upon a Planet 

Upon returning to the amusement park planet, the Enterprise crew finds the computer, which generates the planet's sophisticated robots, running amok, with the caretaker nowhere to be found.


Hal Sutherland


Gene Roddenberry (created by), Chuck Menville | 2 more credits »




Episode complete credited cast:
William Shatner ... Capt. Kirk (voice)
Leonard Nimoy ... Mr. Spock (voice)
DeForest Kelley ... Dr. McCoy (voice)
George Takei ... Sulu (voice)
Nichelle Nichols ... Uhura / Alice (voice)
Majel Barrett ... Lt. M'Ress / Queen of Hearts (voice)
James Doohan ... Scott / Arex / White Rabbit / Gabler / Master Computer (voice)


With the crew in need of shore leave, Kirk directs the Enterprise for a return visit to the Amusement Park planet, but it shortly becomes evident that the planet is no longer welcoming when it takes Uhura hostage and sends characters to remove Dr. McCoy's head. The caretaker has died, leaving an artificially intelligent computer to take charge, a machine operating under one or two important misconceptions. Written by statmanjeff

Plot Summary | Add Synopsis


TV-PG | See all certifications »

Did You Know?


This is the first time in TAS that the interior of the Enterprise's hangar deck is shown. Visible in the hangar deck are a shuttle of the same design as the Galileo & Columbus (although it has no registry number on its side), a heavy shuttle from Star Trek: The Animated Series: Mudd's Passion (1973) and the long range shuttle Copernicus from Star Trek: The Animated Series: The Slaver Weapon (1973). See more »


Scotty operates the transporter controls, but at 8:10 when the shot focuses on his hands, it's the absent, mustached Lt. Kyle who operates them. See more »


Mr. Spock: I think it prudent to remember that, on this planet, anything we think may be used against us. We must monitor our thoughts and give our enemy no more ammunition.
See more »


Featured in Drawn to the Final Frontier (2006) See more »

User Reviews

Bad...but not horrible.
9 April 2015 | by MartinHaferSee all my reviews

When this episode of "Star Trek: The Animated Series" begins, I had high hopes. Sure, the animation was a steaming pile of crap (as usual) but I was happy to see this show visiting one from the original (and GOOD) series. In the original episode "Shore Leave", the crew lands on a planet not realizing it's a pleasure planet where the crew can live out their fantasies in complete safety--sort of like a nice version of "West World". However, inexplicably, instead of it being a fun time, Uhura is kidnapped and McCoy attacked by the computer running the planet. To stop it, it takes Kirk, Spock and Uhuru to talk sense into the computer and butter up it's ego. In the end, the computer says it's sorry for acting like a butt-head and everyone is happy.

Apart from the crappy animation, this show suffers from a sub-par script that was very disappointing. Now completely horrible but it sure should have been better.

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Release Date:

3 November 1973 (USA) See more »

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Color | Color (technicolor)
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