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The Autobots discover that Dark Energon is responsible for an epidemic of natural disasters.


This is the three part finale of Season 1. Most of it is over how Unicron is the rising darkness the prophecy is speaking of and how he is rising. Part 1 is covering how the 'bots are able to figure out what the culprit is. Part 2 is over how Optimus fights the Unicron foot-soldiers (how Megatron describes them) and they eventually team up to defeat Unicron. Part 3 is finalizing how the teamwork goes.

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"Before the beginning...there was Primus. And there was Unicron. One, the incarnation of creation - the other of destruction. For eons, Primus and Unicron battled, the balance of power shifting between them more times than could be counted. Only be creating the Thirteen - the original Primes who preceded me - was Primus finally able to defeat Unicron and cast him out. Primus became one with the very core of our planet, creating life through the Well of All Sparks, while Unicron was never to be heard again...until now."
-Optimus Prime on the story of how Primus defeated Unicron


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