Change!! Getter Robo: Crater Battle

The first Getter Robo series chronologically. Published 15 years before the rest of the manga, Getter Robo pioneered the idea of the combining and transforming robot. Millions of years ago, the dinosaurs were driven deep underground due to the sudden arrival of "Getter Rays" on Earth. After evolving into sentient beings, they grew bitter and vengeful at the humans who replaced them on the surface and began plotting their attack on humanity. Fighting against them is Getter Robo, a machine built by Professor Saotome which uses the mysterious Getter Rays as its power source. Piloting it are three strong-willed young men - the violent martial artist Nagare Ryoma, the psychopathic yet highly intelligent revolutionary Jin Hayato, and the hot-blooded Judo master Tomoe Musashi. Each controls one of three specially designed combat jets which can be combined together in different forms to form three different kinds of giant robots: the flying, axe-wielding Getter-1, the quick, drill-wielding Getter-2, and the tough, tank-like Getter-3.

Shin Getter Robo is the third Getter Robo series chronologically. Years after the original story and in a brief time of peace, Professor Saotome has completed his masterpiece, the Shin Getter Robo, while humanity makes large advancements in space exploration and Getter Rays research. Unfortunately, this progress brings them to the attention of a mysterious and hostile race from across time and space. *Note: Includes an extra chapter that was published on the last volume.*