Transformers: Unicron (Transformers: Unicron #1)

The Darkest Hour has come. Optimus Prime stages a desperate gamble as the world-eater, Unicron, approaches Windblade’s homeworld - but that’s just the appetizer. The main course is Cybertron (with a side of Earth)... and it’s starting to look like no force in the galaxy can stop the end from coming.