Fulton Balcus was the seemingly mild-mannered president of the Chronos Corporation. He was actually an evil Zoalord whose ultimate goal was to take over the world by building armies of Zoanoids and equipping them with Guyver units. But when Dr. Tetsu Segawa stole the only Guyver Chronos had in its possession, Balcus sent his Zoanoid minions, led by Lisker, to kill the scientist and retrieve the unit.
The Guyver was instead found by Sean Barker. Using its powers, he transformed into a super-human powerhouse and killed all of Balcus' Zoanoids. Determined to obtain the Guyver, Balcus transformed into his true self, the Zoalord (a monstrous beast that resembled a spider crossed with a dinosaur) and attempted to pry the unit's control medallion from Sean's forehead, only to be destroyed by a blast of energy from the armor's chestplate.