Dr. Exavolt was once the Head Scientist of the pre-Mil Iron Star. He was one of the science bots, the only model able to understand and upgrade the workings of the other models. However, scientists could not understand or upgrade themselves. In an attempt to create a better scientist, Exavolt created General Corrosive . The project created disastrous results for the planet Iron Star. Corrosive went on a rampage and destroyed the entire science lab he was created in. No remains of Exavolt were found after the incident. It turns out that Exavolt was behind the mils and intended to create General Corrosive.