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The Unicron Trilogy is a term used to refer to the three Transformers story and toy lines-Transformers: Armada, Transformers: Energon, and Transformers: Cybertron-that are all tied together by the presence/influence of the character Unicron.
Armada focuses heavily on the Mini-Cons, miniature Transformers created by Unicron, who is also the true antagonist of the series. The plotline of Energon centers around the attempts of Alpha Q and later Megatron to revive Unicron for their own purposes, and the subsequent threat posed by his evil influence and the designs of Primus to employ his powers for good. In Cybertron Megatron returns due to claiming the armor of Unicron, whose demise is also responsible for the black hole threatening the universe throughout the course of the series. This plotline differs from the three cartoons' Japanese counterparts Micron Legend, Superlink, and Galaxy Force; while the former two are connected, the third was initially considered a separate series.