An Ankylosaurus-like monster covered with magnetic plates with two tails. From its shoulders were two appendeges that fired flashes of blinding light. A thief called Kaitou Mati was on the loose and he broke into houses by cracking security systems. He robbed the Babas and proceeded to Taksehi's house, but fled after an encounter with Kahn Digifer. Conveniently, a security expert showed up and offered his new revolutionary home security system called Cat Eye Security. Takeshi learned of the break-in and soon discovered that Kaitou Mati and the expert were the same person! To punish the swindler, Takeshi created Magnegauss to infect the Cat Eye System. Anyone with this system installed would become trapped in their homes. Gridman could not defeat the monster alone; Magnegauss used its magnetic powers to deflect many of Gridman's attacks and drain his power as well. Ippei modified the vehicles to combine into God Zenon giving Gridman the chance to use the Grid Beam to destroy Magnesgauss.