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Continuing their perfidy from the earlier episode "Fire in the Sky," the Decepticons locate an ancient crystal in the North Pole which will enable them to sap Earth of its energy. But they can no longer count upon the assistance of Skyfire, who has switched his allegiance to the Autobots. With Skyfire's help, the good Transformers endeavor to retrieve the Crystal and restore the balance of nature. "Fire on the Mountain" was telecast in America on December 22, 1984