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Keeper of the Ancient Ruins is the 47th episode of He-Man and the Masters of the Universe, written by Lee Robert and directed by Bill Reed. In the ruins of an old city, Man-At-Arms and Professor Smallen discover the Book of Ancient Eternia, but their presence activates robot guardians programmed to protect the site.
He-Man tells viewers museums are storehouses of knowledge, and knowledge is a power more precious than gold or jewels.
- The old city and its guardian robots presumably were constructed by Ancient Ones in Eternia's Preternia era, long before King Jarod created the planetary government of Eternia (see timeline of Eternia).
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