VIDEOS:
Unicron
Unicron assigns Megatron to destroy the Autobot Matrix of Leadership. In exchange, Unicron reformats Megatron into Galvatron and provides him with new soldiers and a ship to carry out the mission.
Example of:
Deal with the Devil
Darkseid's Son, Kal-El
Example of:
Reforged into a Minion
Transhumanist
Example of:
Reforged into a Minion