He murdered the crew of the ship that had brought Lieutenant Max Fisher to Pago Island to investigate the death of Dan Garrett, hoping to use the vessel to escape. However, the Blue Beetle had followed Fisher to Pago to protect the island's secret. He saved Fisher's life and therefore came into direct conflict with Carapax. He used his ship, the Bug, to sink the ship, and when Carapax tried to commandeer the Bug itself, he was sent hurtling into the Atlantic Ocean, where he sank without a trace. Unfortunately for the Beetle, Carapax simply walked along the ocean bottom until he surfaced in Metropolis. He and the Beetle battled again, but this time, the Beetle fired a missile through a crack in Carapax's outer shell, igniting his power source and blowing up his body from the inside. Later, Carapax was approached by the demon Neron, but he refused Neron's offer of power in exchange for his soul.
After the Blue Beetle's death, Carapax confronted Superman and the new Firestorm. His body had been rebuilt by extraterrestrials and provided with a new power source. Firestorm had to be persuaded not to vaporize Carapax's supposed armor by Superman for a very good reason - he was the robot, not a living being trapped inside it.