Mr. Atoz was an inhabitant of Sarpeidon, a planet whose sun was going to supernova. He was the overseer of a library as well the atavachron, a time portal device which he used to transport the inhabitants of Sarpeidon into the planet's past in order to escape its inevitable destruction. Mr. Atoz had many duplicates of himself to assist him in the library. When the Enterprise landing party arrived on Sarpeidon to take its inhabitants to safety, Mr. Atoz thought they were citizens of his world and scolded them for being late for their transports. After Kirk escaped from Sarpeidon's past, he forced Mr. Atoz to assist him in finding Spock and McCoy. When they were located and returned to the present, Mr. Atoz immediately ran through one of the time portals to Sarpeidon's past in order to escape from the supernova. The landing party was transported back to the Enterprise which sped away just as the light went out permanently on Sarpeidon.
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