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Massive planetoid Transformer that is essentially the embodiment of evil in the Transformers' universe. According to the varying story lines, Unicron exists as a sort of multi-universal being. Meaning that he may be temporarily destroyed in one reality, but is omnipresent in essence. His most recent appearance (that I am aware of) was in a somewhat weakened state, being an extremely powerful tank-like Transformer, rather than a demonic planet omnigod.
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