Enterprise receives a message of some kind, where the only readable word is “terratin”

Bones has some see-through mice that are really not cute.

Then everyone gets glowy

Then they start shrinking!

The Animated Series has the closest close-ups of faces for standard dialogue

Sulu falls off his station and breaks his leg. You can totally tell it was just a stunt double in this shot. It only kind of looks like him.

Then Chapel falls into an aquarium.

Wait, how did she even fall into this thing?

Kirk beams to the planet where the signal was coming from, but when he gets there the little communicator that Spock made for him is small. The transporter cures the shrinking

He finds a little city. I like the background painting in this one.

When he gets back to the ship, the bridge crew had been taken!

He’s able to communicate with the city now. Their communication dish was buried? But somehow they could get out the word “Terratin”? And because they couldn’t communicate, they shrunk everyone?

Kirk beams back the crew along with some dylithium crystals that were broken due to the shrinking process

For some reason Kirk fires a tiny phaser at the city…

…before being able to beam them off the volatile planet

They just happen to have a microscope thing in the transporter room, for all the times they beam aboard people that are 1/16th of an inch