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"One of Our Planets Is Missing"

Episode 3

Written by: Marc Daniels

Directed by: Hal Sutherland

Airdate: Sept. 22, 1973

Stardate: 5371.3

The U.S.S. Enterprise encounters a cloud creature that feeds on the energy of the planets that lie in its path. Spock mind melds with the entity and tells it that it is killing life and he persuades it to return to its place of origin.

Voice Credits:

Regular Characters:
Captain Kirk William Shatner
Mr. Spock Leonard Nimoy
Dr. McCoy DeForest Kelley
Scotty James Doohan
Lieutenent Sulu George Takei
Lieutenent Uhura Nichelle Nichols
Lieutenent Arex James Doohan

Guest Characters:
Cosmic Cloud Majel Barrett
Wesley James Doohan



  • Commodore Robert Wesley was first seen in the original series episode "The Ultimate Computer."
  • In this episode we learned that Commodore Wesley retired from Starfleet to become the governor of Mantilles, a planet with a population of 82 million. We also learned that he had an eleven-year-old daughter.
  • This episode marked the first appearance of Lieutenant Arex.
  • In this episode, when the cloud creature threatened Mantilles, Kirk was prepared to use his ship's self destruct protocol to destroy the cloud's "brain."
  • In this episode's dialog, Kirk refers to once saying "Today I will not kill." Kirk uttered those words in the original series episode "A Taste of Armaggeddon."
  • Stock footage/cels from Lassie's Rescue Rangers, another 1973 Filmation TV show, was used in this episode. Views of Earth on a computer screen were shown to Spock as he was melding with the cloud intelligence. It was these scenes that featured children running with a dog that came from the Lassie show.
  • This episode's story was similar to several other Trek tales such as the original series episode "Immunity Syndrome" and the STAR TREK: Voyager episodes "The Cloud" and "Bliss."
  • Transporter Chief Kyle appeared in this episode but he had no dialogue.
  • A VHS video tape containing "One of Our Planets Is Missing" and "Mudd's Passion" is available for purchase from, the online bookseller.
  • "One of Our Planets Is Missing" was novelized by Alan Dean Foster in Star Trek Log One published by Ballantine Books in June 1974. Also novelized in the book was "Yesteryear" and "Beyond the Farthest Star".


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