The original seven Primes scattered throughout the galaxy looking for planets on which they could build Star Harvesters. These massive machines created energon, the vital energy of Transformers, by destroying suns, and were activated by the artifact of the Primes known as the Matrix of Leadership. The Dynasty of Primes had one rule: Star Harvesters were not to be built in solar systems which contain life. Then, in 17,000 B.C., one of them, Megatronus Prime, arrived on Earth. He believed the Cybertronians were the ultimate race and destined to rule the universe, and hated the human race, and so decided to ignore the Primes' one rule by destroying Earth's sun. To assist him in his construction of a Star Harvester, the treacherous Prime, now known as The Fallen, assembled an army of like-minded Cybertronians who called themselves "Decepticons". Identifying themselves with a symbol based on the fearsome visage of the Fallen, the Decepticons built the Harvester in prehistoric Egypt, and slaughtered any humans who discovered the Harvester. Learning of his betrayal, the other Primes launched an assault on the Decepticon forces. Although they were unable to kill the Fallen, the Primes succeeded in capturing and imprisoning him before sealing the Matrix within a tomb made of their own bodies, thus sacrificing themselves to help save Earth and humanity.