Following on from the massive surge in momentum of Armada, Hasbro (with Takara) had the second chapter of the "Unicron Trilogy" released right at the end of 2003, just as the 20th Anniversary of Transformers was about to begin.
Details of this series can be read up here.
In the Energon era/series, what are you Ultimate top 3, best of the best, to recommend to others....
Toys
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Comic Issues/stories
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Cartoon Episodes/stories
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Later, I might do up a tally, to see if there are any standouts.