Shin Getter Robo vs Neo Getter Robo

Neo Getter Robo is an alternate universe sequel to the original Getter Robo, in which the primary enemies were the Dinosaur Empire, the descendants of the few dinosaurs who survived extinction and hid deep below the Earth's surface, evolving into more humanoid forms. The prologue in the first episode shows a massive Dinosaur invasion of New York City. As Professor Saotome and Hayato rush to activate Shin Getter Robo, Musashi uses the original Getter to hold off the Dinosaurs. When it becomes clear that he cannot stop them under his own power, Musashi crushes the Getter Core, causing an explosion that wipes out almost all of the Dinosaurs, as well as all of Manhattan Island. Responding to the international outcry, the Japanese government banned Getter Energy research and took over Saotome Laboratories, subsidizing it as a self-defense branch called NISAR. Five years later, the Dinosaurs begin to rise again and Hayato, now a member of NISAR, begins recruiting a new Getter team.