Transformers: Energon: Volume 1

Ten years after Unicron attacked Cybertron, the planet is seemingly at peace, with most of the Decepticons absorbed into the community. However, Optimus Prime is still not happy, and fears another attack from Unicron. The High Council are sceptical of this. But events soon lead Optimus Prime to realise that not only is Unicron still functioning, but is on his way to a rich seam of Energon on Earth!