Transformers: Energon

Using Unicron, Megatron has discovered a powerful source of energy: Super Energon. By immersing himself in the liquid, he is transformed into Galvatron, with a new purple armor which makes him impervious to all forms of firepower. Doing this, he awakens the guardians of the Energon, who chose to join him- Constructicon and Bruticus Maximus. However, the third guardian, Superion Maximus, escapes so he sends his new minions after him.