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In the near future, a mineral known as "Japanium" is discovered under Mt. Fuji. This ore is discovered to produce a powerful energy source known as "Photon Energy". Dr. Juzo Kabuto and his associates have begun researching Photon Energy, planning to use it as a solution to the energy crisis plaguing the earth, when the nefarious Dr. Hell and his associate, Baron Ashura attack his lab. Along with this, the mysterious "Kurogane House" also has begun to become entwined with the affairs of these two parties. During all of this, Juzo's grandchildren, Kouji and Shiro, encounter one of Baron Ashura's robots on its way to attack Dr. Kabuto's mansion, where he has begun work on his greatest invention. Dr. Kabuto, seeing the danger at hand, sends out the Pilder to Kouji, allowing him to combine with the giant robot, Mazinger Z, to fight against Dr. Hell's forces.Source: Wikipedia

Set in the near future, humanity enters another energy revolution following the discovery of Photon Power. Derived from the ore discovered under the foothills of Mt. Fuji, its intended use was to solve the world's energy problems with its unimaginable power. Seeking this energy is Dr. Hell, a madman craving world domination who with his subordinates Baron Ashura, Count Brocken and Viscount Pygman, commands an army of mechanical beasts excavated from the ruins of ancient Greece to seize the Photon Power Lab for himself. Meeting the attack head on is the hot-blooded teenager Kabuto Kouji, who pilots the Photon Powered robot built by his grandfather, Mazinger Z. But in this battle between Dr. Hell and the Kabuto family, many legends surrounding the Mycenaean Civilization and Bardos Island, as well as the secrets of Mazinger Z remain shrouded in mystery. A new series based on the mecha show that started it all, Mazinger Z. Shin Mazinger Shougeki! Z-Hen starts over from the beginning with a new cast, to tell a new story unrelated to the original show. (Source: shin-mazinger.com)

Koji Kabuto (兜 甲児, Kabuto Kōji?, played by Kenji Akabane): The protagonist of the story. After the death of his parents, Koji works hard as the 'Mother Hen' to the surviving members of his family - his brother Shiro, and his grandfather Juzo. Koji has a high regard for his grandfather, whose patented inventions were the source of the Kabuto family's income and shows zero tolerance to anyone who ever insults his grandfather. During the primary attack of Ashura Corps., Koji becomes the pilot of his grandfather's greatest invention - the Super Robot Mazinger Z. Like previous incarnations, he is a hot-blooded young man who occasionally acts before he thinks. Shiro Kabuto (兜 シロー, Kabuto Shirō?, played by Ayumi Fujimura): Koji's younger brother. Juzo Kabuto (兜 十蔵, Kabuto Jūzō?, played by Yasuaki Suzuki): Koji's grandfather and the creator of Mazinger Z. Known as a great robotics engineer in addition as the man who discovered the Japanium Ore, which lead to the creation of the Photon Energy and Super-Alloy Z (a metal alloy that is stronger than any other metal known to man). Along with Dr. Hell, he uncovered the Mechanical Beasts on Bardos Island but opposed him upon discovering the dangers of the Kedora. Kenzo Kabuto (兜 剣造, Kabuto Kenzō?): The son of Juzo Kabuto and father of Koji and Shiro Kabuto. In the original series, Kenzo and his wife are believed to have been killed in an accident involving the construction of Mazinger Z. In reality, Kenzo survived and later built Great Mazinger in secret, without the knowledge of his sons. In Shin Mazinger, he is stated to have died previous to the series and a number of episodes are dedicated to Koji learning of the truth of his death. In the earlier Episodes, Kenzo was shown to be a traitor and followed Dr. Hell. Nishikiori Tsubasa was forced to kill Kenzo with the help and request of Tetsuya. But in Episode 26, it was shown that he is still alive having cut-off the infected body that Dr. Hell corrupted during the re-constructuring of his damaged hand. It was revealed that Dr. Hell implanted a Kedora in his hand that controlled his mind. He later reveals to Tsubasa that the Mycenae empire would come if Kouji defeats Dr. Hell.