While exploring a burnt out supernova the Enterprise track a strange signal with the unrecognized word ""terratin"". They track it to the single planet orbiting the supernova and are hit with a burst of light from the volcanic planet. The crew and all organic matter begin to shrink while the ship's circuits are fused and the dilithium burned out. Struggling against a ship that they will soon be unable to control, they beam Kirk down to the signal source. The transporter recreates him from the original pattern, restoring him to normal size. The planet is plagued with volcanic activity and has a radiation that when focused causes organic shrinkage. Kirk finds a miniature city just before being beamed back up on automatic. He finds the ship deserted: the city below beamed the Enterprise crew, now at their same size down. The ""shrink attack"" was the only way they had to contact Enterprise, and they are about to be destroyed by volcanic activity. They were a lost colony: Terra 10 (i.e., ""terr
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