G1

The G1 is a Mechanical Beast that has been modified by Kenzo Kabuto. It serves as the prototype of the Great Mazinger. It's the "brother" to the Z1. It appeared in Mazinger Z: Mycenae no Densetsu no Maki.

Abilities
All the G1 have is an extreme amount of strength. Able to blow through Mechanical Beasts in one punch.

History
When Dr. Hell took hostage of a bunch of researchers to work on repairing the Mechanical Beasts, Kenzo and his father, Juzo, secretly work on their own Mechanical Beasts and modified them to contain human pilots. When the preparation were complete, Kenzo and Juzo use the now christen, G1 and Z1, and tore threw the Mechanical Beasts that Dr. Hell sent to prevent them from escaping. The G1 and Z1 manage to prevail but Kenzo was apparently injured during the fight.