While the Enterprise investigates a water-world, Captain Kirk and Commander Spock go missing. They've been abducted by the world's inhabitants and altered into water breathers as well.
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After Kirk's mutated hands are shown to heal, they are again mutated in a later scene. See more
Medical Log: Stardate 5506.2. Captain Kirk and First Officer Spock were rescued forty-eight hours ago. They have no recollection of what happened to them after they were attacked, but medical examinations show an unidentified substance in the blood stream has affected their entire metabolism and changed them into water breathers. Their internal structure is completely transformed, and even their eyes are covered with a transparent film, like the second eyelid of a fish. So far all efforts to ...