Stardate 5577.3: The Enterprise receives a signal from the star Cepheus whose only comprehensible portion is the word "terratin." While in orbit around the planet of origin which is suffering from heavy volcanic activity, a flash of light passes through the ship, paralyzing the crew. Then the crew begins to realize that their bodies, like all organic matter on the ship, are shrinking. Kirk transports to the planet's surface and immediately grows to full size, since the transporter restores all matter to its original size. He discovers a miniature city, but is shortly beamed back to the ship by the transporter's automatic settings. Upon returning, he discovers that his crew has been transported off the ship to the planet surface. The inhabitants of the miniature city are descendants from an old expedition from Earth who had called the planet Terra Ten. As they can't be restored to their original size because of their genetic characteristics, the entire city is beamed aboard the Enterprise for relocation.

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