Series: The Animated Series
Air Date: Dec 1, 1973
Written by: Margaret Armen
Directed by: Hal Sutherland
While examining an ocean planet, Kirk and Spock magically turn into water-breathers.
So, the deal is that the Enterprise has to study this ocean planet because it was overcome with seismic activity that put its oceans over the entire surface and there's another planet that's about ready to do the same. They have to find out how it happened so they can prevent a disaster on this other planet. What they didn't count on was Kirk and Spock turning into fish-men.
Ok, not full-on, green skinned, scaly, finny fish-men, but they do have to breathe water and they do have secondary eyelids. (Or, in Spock's case, tertiary.) Bones tries to figure it out, but they decide that the only way deal with the malady for now is to put them back on the planet where they can live in the ocean at least for a little while. While there, they meet a race of real fish-men: the Aquans.
|Hi, I'm an Aquan, and this is my crib.|
So they go after the cave and fight with a big snake-lobster creature and find the book that holds the cure. They bring it back up to the Enterprise and find that what they need is the venom from that big snake-lobster creature... so they go right back down. With some help from the Aquans, they snag a tooth from the monster and then Bones creates an antidote.
|AND IT... worked?|
Of all the science in all the galaxies in all the universe... you had to walk all over mine. Let's talk about the science of turning an air lung into a water lung, shall we? No? Because you already understand how complicated it should be? Ok, that's fair. Apparently, all it takes is some mysterious ~~unknown hormone~~ on this planet. WHO KNEW?!