Transformers: Armada

The war between the Cybertrons and Destrons rages on planet Seibetron for the sake of controlling the microns, mini Transformers that can link with the bigger Transformers and give them unbeatable powers. Realising that the war is due to them, the microns were sent out to deep space by the Cybertrons on a Cybertron shuttle. The Destrons go in pursuit the shuttle but the shuttle managed to escape and crash-landed on earth. After 4 million years, 3 young brats accidencally activated the mysterious micron ship thus sending signals to both Cybertrons & Destrons. The war between the Cybertrons & the Destrons once again rages on earth to control the microns, thus revealing many mysteries of the universe including the dark force, Unicron.

Synopsis from Anime News Network