His Bodily kind worthless, his anti-spark was pressured to revive Megatron and use him to be a vessel and headed to Cybertron to demolish his arch rival. Unicron would use an un-dead army of Predacons to accomplish this intention forcing the Autobots Yet again to struggle versus him, this time http://socialrus.com/story6280713/little-known-facts-about-transformers-rise-of-unicron