The plot opens some time after the Moon Wars, where things for the original cast have taken a turn for the worse. The main character and pilot of Getter-1, Ryōma Nagare, has been framed for the murder of the Getter Machine builder Dr. Saotome after the death of Saotome's daughter, Michiru. However, he is released from jail and is reunited on Earth—unhappily—with his old allies, Hayato Jin and Musashi Tomoe, to fight none other than Dr. Saotome himself, who has seemingly risen from the grave to threaten humanity with his ultimate creation—and most dangerous weapon, the Shin Getter Dragon. The Shin Getter Dragon is a massive weapon powered by the same cosmic Getter Rays which gave life to their machines. However, their efforts to stop Dr. Saotome (not to mention an overzealous Japanese Defense Force), are in vain, as nuclear weapons are used on Shin Dragon.