Michael

Michael, an elderly researcher in his fifties was the first to discover a portal between an alternate universe known as Vestroia and our world.

After teleporting himself to the other dimension, Michael was quickly sucked up by the evil force of the Silent Core and transformed into a megalomaniac scientist. After returning to earth as HAL-G, he immediately recruited Masquerade in an attempt to help him destroy all the Bakugan standing in his way.