"The Ambergris Element" is the thirteenth episode of the first season of the American animated science fiction television series Star Trek.
Chief Medical Officer Dr. McCoy's analysis indicates that this could not have been accomplished by any natural process, leading to the conclusion that intelligent life must still exist on the planet, but under the seas.
They are referring to Mr. Scott and the rest of the assistance party who moved from their original post to try to inform Kirk and Spock of an impending sea quake.
Despite the ban, Kirk enlists her help in locating the lost formula for reversing the transformation and capturing a giant sur-snake whose venom is key to the antidote.
[1] As part of his 2017 re-watch series of articles of the show, Keith DeCandido rated this a 5 out of 10, citing the episode's climax as "stultifying".