Ok I know there's a lot of Galvatron theories out there, but I would like to share mine as well. After the events of Dark of the Moon, the remains of the destroyed cons are sent into space. After floating for years, they reach Unicron. Unicron uses the junked cons parts and reformats them into Galvatron and his new troops. Armed with new weapons and armor, they head to Earth to prepare for Unicrons arrival (destroy the Matrix?) Thoughts on this theory? Suggestions?