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.
Did You Know?
The animators were rather lazy when the ser-snake attacks the Aquashuttle. When the creature slams it against the rocks, a simple jagged black line is drawn over the shuttle's slightly distorted animation model. As powerful as the impact was, there would have been far more initial damage and pieces flying off. See more
When Kirk and Spock first enter the Sealed Place, one shot shows two successive Kirks swimming, not Kirk and Spock. See more
Captain James T. Kirk
I can't command a ship from inside an aquarium.