Stardate 5499.9: The USS Enterprise arrives at the water planet Argo where heavy quakes once caused the landmasses to sink in the hopes of averting the same disaster on a Federation world. But the aquashuttle is attacked by a sea monster. Kirk and Spock are missing for five days until they are found with a radically changed metabolism -- they are now water breathers. The two descend to the depths of the ocean and are captured by the Aquans, the xenophobic water breathers who transformed them. With the help of Aquans who want to know more about their forefathers who once lived on the surface, Kirk and Spock find the procedure to revert their condition in the ancient library of a submerged city. Using the phasers the Enterprise successfully saves the Aquan city from the quakes and also heaves the old city above the sea level again. Several young Aquans decide to study the ancient records and to eventually return to the surface.

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