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#74: Star Trek: The Animated Series, season 1, episode 13 "The Ambergris Element"

Written by Margaret Armen, directed by Hal Sutherland.

Stardates 5499.9 through 5506.2 (early 2269)

"I did not believe such knowledge was possible." - Domar

The Enterprise is sent to study Argo, a planet whose surface has almost completely sank into its ocean due to seismic activity in an effort to prevent a similar disaster on other Federation worlds. As Captain Kirk and Commander Spock explore the surface with an away team, their shuttlecraft comes under attack by a previously unknown sea creature. They conclude that the initial survey of the planet was incomplete and are attacked again, this time Kirk and Spock are pulled underwater with the wrecked shuttle. When they come to, they are washed ashore and gasping for air. Doctor McCoy realizes the've mutated to be able to breathe underwater by unknown means. This leads to the assumption that there may be an advanced civilization deeper underwater. With their new-found abilities, Kirk and Spock search the depths of the ocean and find water-dwelling humanoids who run at the sight of them. When Commander Scott reports that a massive underwater tremor is imminent, Kirk and Spock try to establish communication with a species that distrusts land dwellers and find a way to protect them from the tremors while also figuring out how to undo their mutation.

Originally released: 1 December 1973

"The Ambergris Element" on Memory Alpha (mirror)

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