After a failed attempt by G-Force to lure a wounded Godzilla out of Canada, the order was sent to activate Cybersaur, a powerful machine created by G-Force and the U.N. in preparation of Godzilla's eventual return. Challenging Godzilla, the mechanical defender unloaded its arsenal at the King of the Monsters, but it wasn't enough. A blow to the head from Godzilla's tail caused massive damage within the mecha's cockpit and the golden mech was blown off its feet by Godzilla's atomic ray. A kick to the head as Godzilla passed by caused even more internal damage. Eventually, G-Force was able to repair Cybersaur and sent it once more to engage Godzilla. This time the mech fared much better, assaulting Godzilla with its firepower before activating the G-Buster, a massive cannon originating from Cybersaur's torso. One blast from the G-Buster was all it took to send Godzilla falling to the ground, apparently dead.

Later on, when the space monster Bagorah arrived on Earth, Cybersaur was sent to intercept him. A single blast from Cybersaur's shoulder laser cannons was enough to send the giant bat screaming into the ocean. The next night, Bagorah returned, but Cybersaur had been refitted with a sonic disrupter to disorient the beast. Unfortunately, it had only a temporarily effect on Bagorah, who attacked Cybersaur with a flying headbutt, sending the machine crashing onto its back. Attacked by its foe's teeth and talons, the mechanical marvel was damaged beyond repair.

As Godzilla and Bagorah battled in Vancouver, Cybersaur exploded, never to see combat again.