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Robots in Disguise
Galvatron later combines with the fortress, connecting to the end of one of it's arms in hand mode, in order to battle with Fortress Maximus, but was defeated after a brief conflict that appears to have resulted in the Megastar's destruction.
"Ask Vector Prime" revealed that an alternate Galvatron also possessed a Megastar, and welcomed Cryotek aboard in exchange for the time-traveling Predacon's aid in reformatting himself into a new form that would allow him to control Fortress Maximus.